Updated on 2024/11/19

写真a

 
SATO Hirohiko
 
Organization
Faculty of Science and Engineering Professor
Other responsible organization
Physics Course of Graduate School of Science and Engineering, Master's Program
Physics Course of Graduate School of Science and Engineering, Doctoral Program
Contact information
The inquiry by e-mail is 《here
External link

Degree

  • Ph. D ( Kyoto University )

Education

  • 1988.3
     

    Kyoto University   Faculty of Science   graduated

Research History

  • 2012.3 - 2013.3

    "Guest Researcher, Physics Department, Technical University of Denmark"

  • 2008.4 -  

    中央大学理工学部教授

  • 2007.4 - 2008.3

    中央大学理工学部准教授

  • 2001.4 - 2007.3

    中央大学理工学部助教授

  • 1994.6 - 2001.3

    "Research Associate, Department of Chemistry, Tokyo Institute of Technology"

  • 1994.6 - 2001.3

    Research Associate, Department of Chemistry, Tokyo Institute of Technology

  • 1993.4 - 1994.6

    "IMS Fellow, Institute for Molecular Science"

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Professional Memberships

  • 日本物理学会

  • 日本化学会

Research Interests

  • 無機化学

  • 無機材料・物性

  • 磁性・金属・低温

  • 光物性・半導体・誘電体

  • 機能・物性・材料

  • 応用物性・結晶工学

Research Areas

  • Nanotechnology/Materials / Inorganic/coordination chemistry  / 無機化学

  • Nanotechnology/Materials / Inorganic materials and properties  / 無機材料・物性

Papers

  • Difference in magnetic and ferroelectric properties between rhombohedral and hexagonal polytypes of AgFeO2: A single-crystal study Reviewed

    Noriki Terada, Yuta Ikedo, Hirohiko Sato, Dmitry D. Khalyavin, Pascal Manuel, Fabio Orlandi, Yoshihiro Tsujimoto, Yoshitaka Matsushita, Atsushi Miyake, Akira Matsuo, Masashi Tokunaga, Koichi Kindo

    Physical Review B   99 ( 6 )   064402   2019.2

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:American Physical Society  

    We have investigated magnetic and dielectric properties of rhombohedral 3R-AgFeO2 and hexagonal 2H-AgFeO2 by using magnetic and dielectric bulk measurements and a neutron diffraction experiment with single crystals grown by hydrothermal synthesis. Magnetic phase transitions occur at T = 14.0 K and T = 6.0 K in 3R-AgFeO2 and T = 17.0 K and T = 9.5 K in 2H-AgFeO2 under zero magnetic field. Multistep metamagnetic phase transitions were observed in 3R-AgFeO2 in magnetization measurements up to 60 T, while a single phase transition occurs in 2H-AgFeO2. The ferroelectric polarization parallel and perpendicular to the triangular lattice plane appears below T = 6.0 K in 3R-AgFeO2, which is concomitant with the onset of the cycloid magnetic ordering with the propagation vector k = (-1/2,q, 1/2;q similar or equal to 0.2) and the magnetic point group polar m1'. On the other hand, the ferroelectric polarization is absent even below the lower phase transition temperature in 2H-AgFeO2, which can be explained by the proper screw magnetic structure with k = (0, q, 0; q similar or equal to 0.4) and the nonpolar 2221' point group. Although the two-dimensional triangular lattice layers of Fe3+ are common in the two polytypes, the magnetic and ferroelectric properties are significantly different. The emergence of ferroelectric polarization which is not confined to be within the plane of the cycloid for 3R-AgFeO2 can be explained by the extended inverse Dzyaloshinskii-Moriya effect with two orthogonal components, p(1) alpha r(ij) x [S-i x S-j] and p(2) alpha S-i x S-j. Unlike other delafossite compounds, the p(2) component is not allowed in the proper screw phase of 2H-AgFeO2 due to the symmetry restriction of the parent space group.

    DOI: 10.1103/PhysRevB.99.064402

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  • Dinuclear Nickel Complexes Doubly Bridged by Hydrogencyanamido Ligands: Synthesis, Structures and Magnetic Properties Reviewed

    Takuya Kuwabara, Natsumi Shiga, Shintaro Kodama, Hirohiko Sato, Hirohiko Houjou, Youichi Ishii

    European Journal of Inorganic Chemistry   2018 ( 29 )   3413   2018.8

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    Publisher:Wiley  

    DOI: 10.1002/ejic.201800457

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  • Reductive Formation of a Vanadium(IV/V) Oxide Cluster Complex [V8O19(4,4′-tBubpy)3] Having a C3-Symmetric Propeller-Shaped Nonionic V8O19 Core Reviewed

    Yuta Inoue, Shintaro Kodama, Nobuto Taya, Hirohiko Sato, Katsuyoshi Oh-ishi, Youichi Ishii

    Inorganic Chemistry   57 ( 13 )   7491   2018.6

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    Publisher:American Chemical Society ({ACS})  

    DOI: 10.1021/acs.inorgchem.8b00651

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  • Ferromagnetic Peierls insulator state in AMg4Mn6O15 (A=K,Rb,Cs) Reviewed

    T. Yamaguchi, K. Sugimoto, Y. Ohta, Y. Tanaka, H. Sato

    Physical Review B   97   161103   2018.4

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  • Rich magnetoelectric phase diagrams of multiferroic single-crystal alpha-NaFeO2 Reviewed

    Noriki Terada, Yuta Ikedo, Hirohiko Sato, Dmitry D. Khalyavin, Pascal Manuel, Atsushi Miyake, Akira Matsuo, Masashi Tokunaga, Koichi Kindo

    PHYSICAL REVIEW B   96 ( 3 )   035128   2017.7

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER PHYSICAL SOC  

    The magnetic and dielectric properties of the multiferroic triangular lattice magnet compound alpha-NaFeO2 were studied by magnetization, specific heat, dielectric permittivity, and pyroelectric current measurements and by neutron diffraction experiments using single crystals grown by a hydrothermal synthesis method. This work produced magnetic field (in the monoclinic ab-plane, B-ab, and along the c*-axis, B-c) versus temperature magnetic phase diagrams, including five and six magnetically ordered phases in Bab and along Bc, respectively. In zero magnetic field, two spin-density-wave orderings with different k vectors-(0, q, 1/2) in phase I and (q(a), q(b), q(c)) in phase II-appeared at T = 9.5 and 8.25 K, respectively. Below T = 5 K, a commensurate order with k = (0.5,0,0.5) was stabilized as the ground state in phase III. Both B-ab >= 3 T and B-c >= 5 T were found to induce ferroelectric phases at the lowest temperature (2 K), with an electric polarization that was not confined to any highly symmetric directions in phases IVab (3.3 <= B-ab <= 8.5 T), V-ab (8.5 <= B-ab <= 13.6 T), IVc (5.0 <= B-c <= 8.5 T), and V-c (8.5 <= B-c <= 13.5 T). In phase VIc, within a narrow temperature region in B-c, the polarization was confined to the ab plane. For each of the ferroelectric phases, the k vector was (q(a), q(b), q(c)), and noncollinear structures were identified, including a general spiral in IVab an ab cycloid in IVc and V-c, and a proper screw in VIc, along with a triclinic 11' magnetic point group allowing polarization in the general direction. Comparing the polarization direction to the magnetic structures in the ferroelectric phases, we conclude that the extended inverse Dzyaloshinskii-Moriya mechanism expressed by the orthogonal components p1 alpha r(ij) x (S-i x S-j) and p2 alpha S-i x S-j can explain the polarization directions. Based on calculations incorporating exchange interactions up to fourth-nearest-neighbor (NN) couplings, we infer that competition among antiferromagnetic second NN interactions in the triangular lattice plane, as well as weak interplane antiferromagnetic interactions, are responsible for the rich phase diagrams of alpha-NaFeO2.

    DOI: 10.1103/PhysRevB.96.035128

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  • Giant magnetoresistance of novel ferromagnets AMg(4)Mn(6)O(15) (A=K, Rb, and Cs) with highly symmetric structure Reviewed

    Yudai Tanaka, Hirohiko Sato

    JOURNAL OF SOLID STATE CHEMISTRY   248   150 - 156   2017.4

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ACADEMIC PRESS INC ELSEVIER SCIENCE  

    A novel family of cubic manganese oxides, AMg(4)Mn(6)O(15) (A=K, Rb, and Cs), were discovered. In this type of structure, the MnO6 octahedra share edges, constructing a highly symmetric framework where Mn atoms form a three-dimensional network of truncated octahedra. The crystallographic site of Mn is unique and the average oxidation state of Mn is 3.5, indicating a mixed-valence electronic state where Mn3+ and Mn4+ sites are completely indistinguishable. These compounds become ferromagnetic with fully polarized magnetic moments of Mn ions. The ferromagnetic transition temperature Tc is 170 K, that is considerably high for manganese oxides. The electric resistivity of KMg4Mn6O15 is about 10(5) Omega cm at 300 K and exhibits a non-metallic temperature dependence. It reveals a large negative magnetoresistance; about 40% of the resistivity is suppressed by 5 T of magnetic field at T-C.

    DOI: 10.1016/j.jssc.2017.02.003

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  • Structural deformation of the S=1 kagome-lattice compound KV3Ge2O9 Reviewed

    Eigo Takagi, Takuya Aoyama, Shigeo Hara, Hirohiko Sato, Tsuyoshi Kimura, Yusuke Wakabayashi

    PHYSICAL REVIEW B   95 ( 10 )   104416   2017.3

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER PHYSICAL SOC  

    The dielectric and structural properties of the S = 1 kagome antiferromagnet KV3Ge2O9 are examined. The low-temperature structure below 50 K is orthorhombic with a typical correlation length of 8 nm. While the high-temperature hexagonal phase can be considered C-centered orthorhombic, the C-centered symmetry is broken below 50 K. The low-temperature symmetry does not support the simplex solid state, which is the theoretically expected ground state for the S = 1 kagome lattice. Above 60 K, incommensurate lattice modulation is observed. The lock-in transition suggests that the origin of the orthorhombic deformation is the development of a short-range magnetic ordering.

    DOI: 10.1103/PhysRevB.95.104416

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  • Dzyaloshinsky-Moriya Interaction and the Ground State in S=3/2 Perfect Kagome Lattice Antiferromagnet KCr3(OH)(6)(SO4)(2) (Cr-Jarosite) Studied by X-Band and High-Frequency ESR Reviewed

    Susumu Okubo, Ryohei Nakata, Shohei Ikeda, Naoki Takahashi, Takahiro Sakurai, Wei-Min Zhang, Hitoshi Ohta, Tokuro Shimokawa, Tru Sakai, Koji Okuta, Shigeo Hara, Hirohiko Sato

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   86 ( 2 )   024703   2017.2

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:PHYSICAL SOC JAPAN  

    A single-crystal S = 3/2 perfect kagome lattice antiferromagnet, KCr3(OH)(6)(SO4)(2) (Cr-jarosite), has been studied by X-band and high-frequency electron spin resonance (ESR). The g-values perpendicular to the kagome plane (c-axis) and in the plane were determined to be g(c) = 1.9704 +/- 0.0002 and g(xi) = 1.9720 +/- 0.0003, respectively, by high-frequency ESR observed at 265 K. Antiferromagnetic resonances (AFMRs) with an antiferromagnetic gap of 120 GHz were observed at 1.9 K, which is below T-N = 4.5 K. The analysis of AFMR modes using the conventional molecular field theory gave d(p) = 0.27K and d(z) = 0.07 K, where d(p) and d(z) are in-plane and out-of-plane components of d vector of the Dzyaloshinsky-Moriya (DM) interaction, respectively. On the basis of these results and the exchange interaction of J = 6.15K estimated by Okuta et al., the ground state of Cr-jarosite was discussed in connection with the Monte Carlo simulation results with classical Heisenberg spins on the kagome lattice by Elhajal et al. Finally, the angular dependence of the linewidth and lineshape observed at 296K by X-band ESR showed the typical behavior of a two-dimensional Heisenberg antiferromagnet, suggesting the good two-dimensionality of Cr-jarosite.

    DOI: 10.7566/JPSJ.86.024703

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  • 17aCM-2 Single-crystal growth and high-magnetic-field properties of multiferroic triangular-lattice antiferromagnet 3R-AgFeO2 and α-NaFeO2

    Ikedo Y., Sato H., Kindo K., Matsuo A., Tokunaga M., Miyake A., Terada N.

    Meeting Abstracts of the Physical Society of Japan   70   872 - 872   2015

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    Language:Japanese   Publisher:The Physical Society of Japan (JPS)  

    DOI: 10.11316/jpsgaiyo.70.2.0_872

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  • THz ESR study of perfect kagome lattice antiferromagnet Cr-jarosite

    Hitoshi Ohta, Susumu Okubo, Ryohei Nakata, Shohei Ikeda, Naoki Takahasi, Takahiro Sakurai, Wei Min Zhang, Tokuro Shimokawa, Koji Okuta, Shigeo Hara, Hirohiko Sato

    International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz   2014.11

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    Publishing type:Research paper (international conference proceedings)  

    © 2014 IEEE. THz ESR measurement has been a powerful means to study magnetic systems due to the advantages of high spectral resolution, ESR measurement beyond the zero field splitting or the magnetic phase transition. Using these advantages we have studied perfect kagome lattice antiferromagnet Cr-jarosite, which has attracted much attention in the field of magnetism recently, by our THz ESR.

    DOI: 10.1109/IRMMW-THz.2014.6956420

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  • Crystal structure and magnetism of Fe-2(OH)[B2O4(OH)] Reviewed

    Yotaro Kurayoshi, Shigeo Hara, Hirohiko Sato, Cathrine Frandsen, Steen Morup, Helge Kildahl Rasmussen, Shin Nakamura

    JOURNAL OF PHYSICS-CONDENSED MATTER   26 ( 26 )   266002   2014.7

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:IOP PUBLISHING LTD  

    The structure and magnetism of Fe-2(OH)[B2O4(OH)] are reported. Powder x-ray diffraction reveals a characteristic structure containing two crystallographically independent zigzag-ladder chains of magnetic Fe2+ ions. Magnetization measurements reveal a phase transition at 85 K, below which a weak spontaneous magnetization (approximate to 0.15 mu B/Fe) appears. Below 85 K, magnetization increases with decreasing temperature down to 70 K, below which it decreases and approaches a constant value at low temperature. The Mossbauer spectrum at room temperature is composed of two paramagnetic doublets corresponding to the two crystallographic Fe2+ sites. Below 85 K, each doublet undergoes further splitting because of the magnetic hyperfine fields. The temperature dependence of the hyperfine field is qualitatively different for the two distinguishable Fe2+ sites. This is responsible for the anomalous temperature dependence of the magnetization.

    DOI: 10.1088/0953-8984/26/26/266002

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  • 遷移金属酸化物および水酸化物の水熱合成と磁性の研究 Reviewed

    原茂生, 佐藤博彦

    高圧力の科学と技術   24 ( 3 )   223 - 229   2014.3

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:日本高圧力学会  

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  • Hydrothermal Synthesis of Transition Metal Oxides|rn|and Hydroxides and Study of Their Magnetic Properties Reviewed

    Shigeo Hara, Hirohiko Sato

    高圧力の科学と技術   24 ( 3 )   223   2014

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:日本高圧力学会  

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  • Magnetic property of a single crystal of spin-1/2 triple-chain magnet Cu-3(OH)(4)SO4

    Yutaka Fujii, Yuya Ishikawa, Hikomitsu Kikuchi, Yasuo Narumi, Hiroyuki Nojiri, Shigeo Hara, Hirohiko Sato

    JOURNAL OF THE KOREAN PHYSICAL SOCIETY   62 ( 12 )   2054 - 2058   2013.7

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:KOREAN PHYSICAL SOC  

    The spin-1/2 triple-chain magnet Cu-3(OH)(4)SO4 (mineral name: antlerite) is a candidate 'idlespin' system. In order to study the phase transitions in this compound in detail, we have performed specific-heat measurements under magnetic fields up to 10 T and in the temperature range down to 1.9 K and proton nuclear magnetic resonance (H-1-NMR) experiments with single crystals. We found at least three successive phase transitions at zero field around 5 K which strongly depend on the value and the direction of the applied field. Another transition around 3 K was also found. H-1-NMR spectra in a low-temperature and low-field ordered phase indicated an antiferromagnetic commensurate spin structure with at least four sublattices, which is discussed in connection with the idle-spin state. Phase diagrams show a richness of magnetic phases for this compound.

    DOI: 10.3938/jkps.62.2054

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  • 水熱合成法で作り出す新規ルテニウム酸化物 Reviewed

    佐藤博彦

    セラミックス   48 ( 6 )   436 - 441   2013.6

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:日本セラミックス協会  

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  • Structure and Magnetism of Novel Copper Molybdenum Oxides eta-CuMoO4 and beta-Cu3Mo2O9 Reviewed

    Shigeo Hara, Hirohiko Sato

    J. Phys. Soc. Jpn   82   054802 - 1-5   2013.4

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  • Synthesis and magnetic properties of a new series of triangular-lattice magnets, Na2BaMV2O8 (M = Ni, Co, and Mn) Reviewed

    Genki Nakayama, Shigeo Hara, Hirohiko Sato, Yasuo Narumi, Hiroyuki Nojiri

    J. Phys.: Condens. Matter   25   116003   2013.2

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  • Developments of Multi-Extreme THz ESR System and Its Application to Cr-Jarosite Reviewed

    Hitoshi Ohta, Susumu Okubo, Takahiro Sakurai, Eiji Ohmichi, Weimin Zhang, Tokuro Shimokawa, Ryohei Nakata, Koji Okuta, Shigeo Hara, Hirohiko Sato

    2013 38TH INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER, AND TERAHERTZ WAVES (IRMMW-THZ)   2013

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

    Multi-extreme THz ESR measurements have been performed on Cr-jarosite, which is an ideal model substance of highly frustrated kagome antiferromagnet. The analysis of antiferromagnetic resonances observed at 1.9K revealed the Dzyaloshinsky-Moriya interaction, which plays an important role on the ground state.

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  • Exotic Magnetism of Novel S = 1 Kagome Lattice Antiferromagnet KV3Ge2O9 Reviewed

    Shigeo Hara, Hirohiko Sato, Yasuo Narumi

    J. Phys. Soc. Jpn   81 ( 7 )   073707 - 1-4   2012

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Physical Society of Japan  

    Single crystals of the novel vanadium oxide compound KV3Ge2O9 have been synthesized. This compound has a hexagonal unit cell with the space group P6(3)/mmc. Its lattice constants are a = 5.8624(4) angstrom and c = 13.7094(7) angstrom. KV3Ge2O9 contains layers of edge-shared VO6 octahedra, where V3+ ions with an S = 1 spin form kagome lattice layers separated by double layers of GeO4 tetrahedra. The magnetic susceptibility shows a broad maximum at approximately 70 K, suggesting that magnetic transition is suppressed in spite of the presence of strong antiferromagnetic interactions. Below approximately 20 K, the susceptibility under a magnetic field perpendicular to the kagome plane steeply drops toward zero, while the in-plane susceptibility diverges with reduction in temperature.

    DOI: 10.1143/JPSJ.81.073707

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  • Observation of 1/3 Magnetization-Plateau-Like Anomaly in S=3/2 Perfect Kagome Lattice Antiferromagnet KCr3(OH)(6)(SO4)(2) (Cr-jarosite) Reviewed

    Koji Okuta, Shigeo Hara, Hirohiko Sato, Yasuo Narumi, Koichi Kindo

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   80 ( 6 )   2011.6

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    Single crystals of the S = 3/2 kagome lattice antiferromagnet KCr3(OH)(6)(SO4)(2) (Cr-jarosite) have been synthesized. Magnetic susceptibility measurement reveals an antiferromagnetic transition at T-N = 4.5 K. A weak ferromagnetism with a spontaneous magnetization along the c-axis appears below T-N. High-field magnetization measurement reveals an anomaly at about 1/3 of the saturation magnetization under in-plane magnetic fields, however, the out-of-plane magnetization curve is almost linear. In contrast to ordinary field-induced transitions, the anomaly is less pronounced at lower temperatures. This observation is consistent with the prediction made using the order-by-disorder model on the 1/3 magnetization plateau.

    DOI: 10.1143/JPSJ.80.063703

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  • Successive Magnetic Transitions in Candidate "Idle-Spin" System, Cu-3(OH)(4)SO4 Reviewed

    Shigeo Hara, Hiroki Kondo, Hirohiko Sato

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   80 ( 4 )   043701 - 1-4   2011.4

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    Single crystals of Cu-3(OH)(4)SO4 containing triple chains of S = 1/2 spins were synthesized by a hydrothermal method. This compound is a candidate "idle-spin" system in which some of its spins seem to disappear, while the rest exhibit a long-range order. Its magnetic susceptibility indicates an antiferromagnetic transition at T-N = 5: 5 K, below which a large anisotropy appears. Unlike its magnetic structure predicted from neutron studies, its spin-easy axis slightly deviates from the c-axis. Two-step field-induced magnetic transitions occur in the magnetization curves below T-N under magnetic fields along the c-and a-axes. Furthermore, magnetic fields much below the saturation field, regardless of their direction, induce a transition into a paramagnetic phase.

    DOI: 10.1143/JPSJ.80.043701

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  • Structure and Magnetic Properties of New Trigonal Iron-Boracite, Fe3B7O13(OH) Reviewed

    Ippei Nomoto, Hirohiko Sato, Tomoya Fukui, Yasuo Narumi, Koichi Kindo, Shin Nakamura, Yorihiko Tsunoda

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   80 ( 1 )   014801 - 1-7   2011.1

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    The magnetic properties of a newly synthesized compound, Fe3B7O13(OH), are reported. The space group and lattice constants at room temperature are R3cH (trigonal, #161), a=8.590(3) angstrom and c=21.107(7) angstrom. In this compound, three Fe2+ ions form an equilateral triangular trimer sharing a hydroxide ion, and the trimers further construct a trigonal lattice. The magnetic susceptibility exhibits an antiferromagnetic phase transition accompanied by a steep drop in susceptibility at T-N approximate to 4.8K under small magnetic fields. Mossbauer spectroscopy indicates that Fe ions are divalent. It also suggests a simple spin structure in which all of the spins are equally canted from the principal axis of the electric-field gradient below T-N. This magnetic ground state is, however, easily destroyed by almost 1 T of magnetic field regardless of its direction. In addition to this transition, successive metamagnetic transitions are induced by larger magnetic fields. The additional transitions are strongly dependent on the direction of the applied magnetic field, resulting in a rich magnetic phase diagram.

    DOI: 10.1143/JPSJ.80.014801

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  • Synthesis and Electronic Properties of TlFe2Se2-delta Reviewed

    Satoshi Horiguchi, Hirohiko Sato, Norio Umeyama, Yoshiaki Hara, Nobuaki Miyakawa, Kouichi Takase, Shin-Ichi Ikeda

    SOLID COMPOUNDS OF TRANSITION ELEMENTS   170   47 - 50   2011

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:TRANS TECH PUBLICATIONS LTD  

    TlFe2Se2-delta was synthesized by a self-flux method with excess amount of selenium. Elemental analysis using energy-dispersive X-ray spectroscopy estimates the deficiency 8 at about 0.5. The magnetic susceptibility reveals an antiferromagnetic transition at T-N approximate to 475 K. The resistivity exhibits a semiconducting behavior with an activation energy, E-A = 0.04 eV. There is a clear anomaly in the resistivity at T-N, indicating a strong interplay between magnetism and electric conduction.

    DOI: 10.4028/www.scientific.net/SSP.170.47

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  • Synthesis of novel chromium oxide using hydrothermal method and analysis of its magnetism and structure Reviewed

    Shintaro Ogawa, Koji Okuta, Hirohiko Sato

    SOLID COMPOUNDS OF TRANSITION ELEMENTS   170   29 - 32   2011

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:TRANS TECH PUBLICATIONS LTD  

    We have discovered a novel compound Na(0.12)CrO(2)Ge(0.18)O(x)center dot yH(2)O using a hydrothermal method. Its powder X-ray diffraction reveals a monoclinic unit cell with lattice parameters: a = 7.260 angstrom, b = 2.950 angstrom, c = 5.117 angstrom and beta = 103.7 degrees. A Rietveld analysis shows that this compound has a layered structure based on CrO(2) sheets consisting of edge-shared CrO(6) octahedra. Such a layered structure is commonly seen in many hexagonal Cr oxides such as NaCrO(2). A heat treatment at 100 degrees C modifies the crystal structure without destruction of a layered structure based on Cr triangular-lattice, because H(2)O molecules among the CrO(2) sheets are removed at high temperature. Magnetization measurements reveal a spin-glass behavior below T(g) = 3 K.

    DOI: 10.4028/www.scientific.net/SSP.170.29

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  • Structure and magnetism of a novel nickel sulfate Ni(2-delta)SO(5) Reviewed

    Misaki Takahashi, Shigeo Hara, Hirohiko Sato

    SOLID COMPOUNDS OF TRANSITION ELEMENTS   170   25 - 28   2011

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:TRANS TECH PUBLICATIONS LTD  

    We succeeded in synthesizing single crystals of a novel nickel sulfate Ni(2-delta)SO(5) by a hydrothermal method. A single-crystal X-ray diffraction revealed a tetragonal structure with lattice constants, a = 5.184 angstrom and c = 12.91 angstrom. In this structure, one-dimensional chains composed of face-shared NiO(6) octahedra elongate along the a axis and the b axis alternately, constructing a log-cabin' type framework where neighbor chains lying orthogonally to each other are connected by SO(4) tetrahedra. A detailed refinement of the structure suggested that the site occupancy of Ni is only 63%, corresponding to delta approximate to 2/3. Furthermore, X-ray oscillation photographs exhibit diffuse-scattering patterns probably arising from a short-range order of the Ni defects. Magnetic susceptibility revealed an antiferromagnetic transition accompanied by a weak ferromagnetism at 17 K.

    DOI: 10.4028/www.scientific.net/SSP.170.25

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  • Successive Magnetic Transitions on Single Crystal Cu-3(OH)(4)SO4 Reviewed

    Shigeo Hara, Hirohiko Sato

    SOLID COMPOUNDS OF TRANSITION ELEMENTS   170   194 - 197   2011

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:TRANS TECH PUBLICATIONS LTD  

    Cu-3(OH)(4)SO4, a parallel Cu (S = 1/2) triple chain system, is an interesting magnet because an idle-spin state is expected on the central chain. We have succeeded in growing high-quality single crystals of Cu3SO4(OH)(4) by a hydrothermal method from copper sulfate and copper hydroxide. We measured field dependence of the magnetization on a single crystal under various directions of magnetic field up to 7 T. We found a clear magnetic anisotropy and confirmed that the existence of the easy axis lies in the ac plane. Under magnetic fields parallel to the c-axis and the a-axis at 2.5 K, we observed field-induced successive magnetic transitions. In the case of B parallel to c, two anomalies of the magnetization are observed at 0.9 and 1.7 T, On the other hand, there are broad anomalies in the magnetization at 3.7 and 5.6 T in the case of B parallel to a.

    DOI: 10.4028/www.scientific.net/SSP.170.194

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  • Spin-orbit coupling inactivity of Co2+ ion in geometrically frustrated magnet GeCo2O4 Reviewed

    Keisuke Tomiyasu, Ayaka Tominaga, Shigeo Hara, Hirohiko Sato, Tadataka Watanabe, Shin-Ichi Ikeda, Haruhiro Hiraka, Kazuaki Iwasa, Kazuyoshi Yamada

    INTERNATIONAL CONFERENCE ON FRUSTRATION IN CONDENSED MATTER (ICFCM)   320   2011

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    We report single-crystal neutron diffraction studies on a spinel antiferromagnet GeCo2O4, which exhibits magnetic order with a trigonal propagation vector and tetragonal lattice expansion (c/a similar or equal to 1.001) below T-N = 21 K. For this inconsistency between spin and lattice in symmetry, magnetic Bragg reflections with a tetragonal propagation vector were discovered below TN. We discuss spin and orbital states of Co2+ ion underlying the new magnetic component.

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  • Li7RuO6: As a 4d Heisenberg Frustrated Magnet Reviewed

    Kanako Nakajima, Hirohiko Sato, Tomoya Fukui, Masahiro Iwaki, Yasuo Narumi, Koichi Kindo, Yutaka Itoh, Chishiro Michioka, Kazuyoshi Yoshimura

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   79 ( 6 )   064705 - 1-5   2010.6

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    The structural and magnetic properties of Li7RuO6 were investigated in single crystals. This ruthenate is composed of quasi-two-dimensional distorted triangular lattices of RuO6 octahedra isolated from each other. Because of the (t(2g))(3) electron configuration of Ru5+, a Heisenberg-type magnetic behavior of S = 3/2 spins is expected. The magnetic susceptibility reveals an antiferromagnetic transition at T-N = 6.5 K, much lower than the absolute value of the Weiss temperature Theta = -75 K, indicating a strong geometric frustration. The small and almost isotropic drop of the susceptibility below T-N suggests a helical magnetic structure. Specific heat revealed an additional phase transition at T'(N) = 12 K, suggesting an unconventional magnetic phase diagram.

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  • Discovery of Ferromagnetic-Half-Metal-to-Insulator Transition in K2Cr8O16 Reviewed

    Kunihiro Hasegawa, Masahiko Isobe, Touru Yamauchi, Hiroaki Ueda, Jun-Ichi Yamaura, Hirotada Gotou, Takehiko Yagi, Hirohiko Sato, Yutaka Ueda

    PHYSICAL REVIEW LETTERS   103 ( 14 )   146403 - 1-4   2009.10

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    The hollandite chromium oxide K2Cr8O16 has been synthesized in both powder and single-crystal form under high pressure. Combining electrical resistivity, magnetic susceptibility, and x-ray diffraction, we found that K2Cr8O16 is a ferromagnetic metal (or half-metal) with T-C=180 K and shows a transition to an insulator at 95 K without any apparent structural change but retaining ferromagnetism. K2Cr8O16 is quite unique in three aspects: It has a rare mixed valence of Cr3+ and Cr4+; it has a metal (or half-metal)-to-insulator transition in a ferromagnetic state; and the resulting low-temperature phase is a rare case of a ferromagnetic insulator. This discovery could open a new frontier on the relation of magnetism and conducting properties in strongly correlated electron systems.

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  • Quantum magnetism of perfect spin tetrahedra in Co4B6O13 Reviewed

    Hiroyuki Hagiwara, Hirohiko Sato, Masahiro Iwaki, Yasuo Narumi, Koichi Kindo

    PHYSICAL REVIEW B   80 ( 1 )   014424 - 1-5   2009.7

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    Co4B6O13 contains undistorted tetrahedral clusters of magnetic Co2+ ions. The high-field magnetization of this magnet exhibits a periodic undulation indicating quantization of the total spin number per cluster. Measurements of magnetic susceptibility and specific heat reveal that the ground state is composed of several different singlet states, reflecting the high symmetry of the spin tetrahedron. An exact diagonalization calculation taking account of single-ion-type anisotropies and Dzyaloshinsky-Moriya interactions reproduces the experimental results very well.

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  • Frustrated magnetism of Co4(BO2)6O Reviewed

    Hiroyuki Hagiwara, Hirohiko Sato, Masahiro Iwaki, Yasuo Narumi, Koichi Kindo

    25TH INTERNATIONAL CONFERENCE ON LOW TEMPERATURE PHYSICS (LT25), PART 4   150   042046   2009.3

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    Using a hydrothermal method, single crystals of Co-4(BO2)(6)O were synthesized. The DC susceptibility revealed a Curie-Weiss behavior at high temperature. The Weiss temperature was estimated at -190 K, showing very strong antiferromagnetic interactions. However, the susceptibility does not show any phase transitions down to 2 K, although there is a broad maximum in the vicinity of 14 K. This demonstrates an effect of the geometric frustration arising from the crystal structure based on isolated Co-4 tetrahedral clusters. The magnetization curve exhibits an onset of a transition to higher magnetization state at around 5 T. The result suggests that the Co-4 cluster has a nonmagnetic ground state with a spin gap and a magnetic field induces a transition into a magnetic state above the spin gap.

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  • Critical Slowing Down of Triangular Lattice Spin-3/2 Heisenberg Antiferromagnet Li7RuO6 via Li-7 NMR Reviewed

    Yutaka Itoh, Chishiro Michioka, Kazuyoshi Yoshimura, Kanako Nakajima, Hirohiko Sato

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   78 ( 2 )   2009.2

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    We report on 'Li NMR studies of single crystals of the triangular-lattice Heisenberg anti ferromagnet Li7RuO6. A slow critical divergence with a wide critical region of vertical bar T/T-N - 1 vertical bar <= 7 was observed in Li-7 nuclear spin-lattice relaxation rate. The slowing down of staggered spin fluctuations was analyzed ill it renormalized classical region of a two-dimensional triangular-lattice nonlinear sigma model. Spill stiffness constant was found to decrease to about 20% of its Value in spin-wave approximation. The effect of spill frustration, e.g., Z(2) vortex excitations on critical phenomena, is suggested,

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  • Anomalous electric conductions in KSbO3-type metallic rhenium oxides Reviewed

    Hirotake Suzuki, Hiromi Ozawa, Hirohiko Sato

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   76 ( 4 )   2007.4

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    Single crystals of KSbO3-type rhenium oxides, La4Re6O19, Pb6Re6O19, Sr2Re3O9, and Bi3Re3O11, were synthesized by a hydrothermal method. Their crystal structures can be regarded as a network of three-dimensional orthogonal-dimer lattice of edge-shared ReO6 octahedra. All of them exhibit small magnitude of Pauli paramagnetism, indicating metallic electronic states without strong electron correlations. The resistivity of these rhenates, except Bi3Re3O11, have a temperature dependence of rho(T) = rho(0) + AT(n) (n approximate to 1.6) in a wide temperature range between 5 and 300 K, which is extraordinary for three-dimensional metals without strong electron correlations. The resistivity of Bi3Re3O11 shows an anomaly around at 50K, where the magnetic susceptibility also detects a deviation from ordinary Pauli paramagnetism.

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  • Spin-glass ruthenate: Cubic-LixRuO1+x Reviewed

    Hirohiko Sato, Makoto Soma

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   310 ( 2 )   1517 - 1519   2007.3

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    A novel lithium ruthenate, cubic-LixRuO1+x, was discovered. In this compound, Ru and Li randomly occupy the cation sites of the NaG-type lattice. Magnetic susceptibility measurements revealed a spin-glass transition at 10 K. (c) 2006 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jmmm.2006.10.658

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  • Physisorption-induced change in the magnetism of microporous carbon Reviewed

    H. Sato, N. Kawatsu, T. Enoki, M. Endo, R. Kobori, S. Maruyama, K. Kaneko

    CARBON   45 ( 1 )   214 - 217   2007.1

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    DOI: 10.1016/j.carbon.2006.09.017

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  • Lithium ruthenates: Controlling dimensionality and topology of magnetic-ion arrangements Reviewed

    Makoto Soma, Hirohiko Sato

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   75 ( 12 )   124802 - 1-7   2006.12

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    In order to control the dimensionality and the topology of the arrangement of magnetic Ru ions, NaCl-type lithium ruthenates have been investigated. Three types of lithium ruthenates, Li3RuO4, Li2RuO3, and cubic-LixRuO1+x, were synthesized using a hydrothermal method. All of them have NaCl-type structure, but the arrangements of the cations, Li+ and Ru5+ (or Ru4+), differ from each other. Li3RuO4 with one-dimensional zigzag chains of Ru ions undergoes an antiferromagnetic transition at 66 K and exhibits an irreversibile magnetism below 32K, where the zero-field-cooled susceptibility differs from the field-cooled susceptibility. Li2RuO3 with a two-dimensional honeycomb network of Ru ions demonstrates a paramagnetism almost independent of temperature. A novel ruthenate cubic-LixRuO1+x, in which Ru and Li randomly occupy the cation sites of NaCl lattice, undergoes a spin-glass transition at 10 K.

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  • A novel pyrochlore ruthenate: Ca2Ru2O7 Reviewed

    Taiya Munenaka, Hirohiko Sato

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   75 ( 10 )   103801 - 1-4   2006.10

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    Single crystals of a novel ruthenate, Ca2Ru2O7, were obtained. An X-ray diffraction study on a single crystal revealed that this material crystallizes in a pyrochlore structure with a lattice parameter, a = 10.197 angstrom. The magnetic susceptibility above 30 K is the summation of a Curie-Weiss contribution and a constant term independent of temperature. The effective moment per Ru atom is only 0.36 mu(B), one order of magnitude smaller than that expected from a localized spin model with S = 3/2 for Ru5+. Below 23 K, the localized spins freeze in a spin-glass state. The resistivity at room temperature is 2 x 10(-3) Omega(.)cm, comparable to that in metallic, highly correlated oxides.

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  • Structural, magnetic and electronic transport properties of novel Hollandite-type molybdenum oxide, Rb1.5Mo8O16 Reviewed

    T Ozawa, Suzuki, I, H Sato

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   75 ( 1 )   2006.1

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    Structural, magnetic, and transport properties of a novel hollandite-type molybdenum oxide, Rb1.5Mo8O16 have been investigated. Whereas a typical hollandite structure is characterized by uniform zigzag ladder chains of edge-shared MO6 (M = transition metal) octahedra, the zigzag ladders in Rb1.5Mo8O16 are strongly distorted, and consequently, "Mo-4" clusters composed of four edge-shared MoO6 octahedra are formed. A semiquantitative band calculation based on an extended Huckel method shows that the band structure assumes the characteristics of the molecular orbitals of ail isolated Mo-4 cluster. The magnetic susceptibility reveals the existence of spins spread over each Mo-4 cluster rather than localized on each Mo atom. The electrical resistivity and the thermoelectric power indicate that the electric conduction is governed by cluster-to-cluster electron hopping. Rb1.5Mo8O16 undergoes a phase transtion at T-1 = 208 K, accompanied by a change in the number of spins and carriers. X-ray diffractions at low temperatures detected a slight breakdown of the tetragonal symmetry below T-1. The transport and the magnetic properties of related compounds, K2Mo8O16 and Ba1.14Mo8O16 are also reported.

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  • Bromine-adsorption-induced change in the electronic and magnetic properties of nanographite network systems Reviewed

    K Takai, H Kumagai, H Sato, T Enoki

    PHYSICAL REVIEW B   73 ( 3 )   2006.1

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    Nanographite having open edges has a nonbonding pi-electron state of edge origin (edge state), which causes unconventional electronic and magnetic features. Bromine-adsorption effect on the electronic and magnetic properties of nanoporus carbon consisting of a flexible three-dimensional random nanographite network system is investigated by using activated carbon fibers (ACFs) as host material. The irreversible adsorption of bromine into ACFs at room temperature gives compositions up to Br/C=0.43. The interaction between nanographite and the adsorbed bromine is classified into three groups; charge transfer, covalent bonding, and physisorption interactions, where the latter two are the majorities. Although the charge transfer rate from carbon to bromine is considerably small (0.0004 per C atom at maximum), in comparison with that in bulk graphite-bromine intercalation compounds, the downshift of the Fermi energy results in the large reduction of the localized spin concentration of edge state and the orbital diamagnetism. This proves the important role of the edge state in the charge transfer process. The electron spin resonance results demonstrate the contribution of the orbital character of bromine to the edge state in nanographite through orbital mixing. The physisorbed bromine accommodated into the nanopores induces the dielectric and structural effects on the nanographite. The former causes the modification of the carrier conduction process due to the charging effect, while the latter results in the magnetic switching phenomenon induced by the effective pressure of physisorbed bromine species to the edge-state spins.

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  • J.オグボーン他「アドバンシング物理:新しい物理入門」 Reviewed

    佐藤博彦

    日本物理学会誌   60 ( 2 )   148   2005.2

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  • Ba2Ir3O9: a new 5d mixed-valence metallic oxide with KSbO3-type structure Reviewed

    Y Kawamura, H Sato

    JOURNAL OF ALLOYS AND COMPOUNDS   383 ( 1-2 )   209 - 212   2004.11

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    Crystal structure, magnetic and transport properties of new ternary mixed-valence iridium oxide Ba2Ir3O9 are reported. A hydrothermal reaction of ItO(2) and BaO2 under a pressure of 150 MPa at 650degreesC yields small black crystals with cubic shape. Energy dispersive X-ray analysis on an as-grown crystal gives the atomic ratio Ba:Ir = 2:3. X-ray powder diffraction shows a pattern of cubic lattice with a cell parameter a = 9.42 Angstrom and further Rietveld analysis reveals the KSbO3-related structure. Although the structure of Ba2Ir3O9 is almost identical to Ba0.5IrO3 [Mat. Res. Bull. 9 (1974) 1777], there is a significant difference in the composition between them. Because the crystallographic site for It is unique, Ba2Ir3O9 is classified into class III mixed-valence compound where the average valence of It is +4.67. The magnetic susceptibility shows almost temperature independent Pauli paramagnetism of 2.9 x 10(-4) emu/mol Ir at room temperature. The resistivity for a pellet sample is measured to be 1.5 x 10(-1) Omega cm at room temperature and shows metallic temperature dependence. At low temperature, the temperature dependent component of the resistivity is almost proportional to T-2. This indicates that Ba2Ir3O9 is a bad metal because of strong electron-electron scattering. The narrow 5d-band feature characteristic of the KSbO3-type structure is related to the strong electron correlation. (C) 2004 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jallcom.2004.04.062

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  • New ternary barium ruthenates: 10H-type BaRuO3 and Ba2Ru7O18 Reviewed

    T Ogawa, H Sato

    JOURNAL OF ALLOYS AND COMPOUNDS   383 ( 1-2 )   313 - 318   2004.11

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    We report on structures, magnetisms, and transport properties of two new barium ruthenates, 10H-type BaRuO3 and Ba2Ru7O18. The crystal structure of 10H-BaRuO3 consists of face-shared dimers and trimers; of RuO6 octahedra. The magnetic susceptibility of 10H-BaRuO3 is 7.7 x 10(-4) emu/mol at RT. We interpret its very weak temperature dependence as Pauli paramagnetism enhanced by electron correlations. The resistivity of 10H-BaRuO3 is 8.5 x 10(-2) Omega cm at 296 K. The slope of the R versus T curve is negative in the whole temperature. It indicates metallic or semi-metallic electronic states. The structure of BaRu7O18 is composed of edge-shared trimers and tetramers of RuO6 octahedra. The magnetic susceptibility of Ba2Ru7O18 is 3.7 x 10(-4) emu/mol Ru at RT. Its almost temperature-independent character is also explained in terms of Pauli paramagnetism enhanced by electron correlations. The resistivity of Ba2Ru7O18 is 6.7 x 10(-4) Omega cm at 296 K. In this case, the slope of the R versus T curve is positive, and the temperature dependence is linear to T-1.2 below 25 K. This shows a large deviation from a Fermi-liquid criterion. (C) 2004 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jallcom.2004.04.035

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  • Anomalous magnetism in three-dimensional orthogonal dimer lattice system: (Ba1-x,Sr-x)(2)RU3O9 (x approximate to 0.35) Reviewed

    H Sato, T Watanabe, JI Yamaura

    SOLID STATE COMMUNICATIONS   131 ( 11 )   707 - 711   2004.9

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    The magnetic and transport properties of a new cubic KSbO3-type ruithenate, (Ba1-xSrx)Ru3O9 (xapproximate to0.35), have been investigated. The crystal structure has a singular geometry in which ruthenium atoms form an ideal three-dimensional orthogonal dimer lattice. The magnetic susceptibility is Pauli-paramagnetic but exhibits an anomalous temperature dependence reminiscent of a gap-like behavior. The resistivity exhibits a metallic behavior, except for a rise at low temperature. (C) 2004 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.ssc.2004.03.021

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  • Tuning magnetism and novel electronic wave interference patterns in nanographite materials Reviewed

    K Harigaya, Y Kobayashi, N Kawatsu, K Takai, H Sato, J Ravier, T Enoki, M Endo

    PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES   22 ( 1-3 )   708 - 711   2004.4

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    Antiferromagnetism in stacked nanographite is investigated with using the Hubbard-type models. The A-B stacking or the stacking near to that of A-B type is favorable for the hexagonal nanographite with zigzag edges, in order that magnetism appears. We also find that the open shell electronic structure can be an origin of the decreasing magnetic moment with the decrease of the inter-graphene distance, as experiments on adsorption of molecules suggest. Next, superperiodic patterns with a long distance in a nanographene sheet observed by STM are discussed in terms of the interference of electronic wave functions. The period and the amplitude of the oscillations decrease spatially in one direction. We explain the superperiodic patterns with a static linear potential theoretically. In the k - p model, the oscillation period decreases, and agrees with experiments. The spatial difference of the static potential is estimated as 1.3 eV for 200 nm in distance, and this value seems to be reasonable in order that the potential difference remains against perturbations, for example, by phonon fluctuations and impurity scatterings. It turns out that the long-distance oscillations come from the electronic structure of the two-dimensional graphene sheet. (C) 2003 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.physe.2003.12.105

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  • Theoretical study on novel electronic properties in nanographite materials Reviewed

    Kikuo Harigaya, Atsushi Yamashiro, Yukihiro Shimoi, Katsunori Wakabayashi, Yousuke Kobayashi, Naoki Kawatsu, Kazuyuki Takai, Hirohiko Sato, Jerome Ravier, Toshiaki Enoki, Morinobu Endo

    J. Phys. Chem. Solids   65   123 - 126   2004.4

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  • Crystal structure, magnetic and transport properties of new ruthenate phase, Ba2Ru7O18 Reviewed

    Hirohiko Sato, Toshiyuki Ogawa, Noriki Okuda, Junichi Wakabayashi

    Journal of Physical Society of Japan   72 ( 12 )   3035 - 3038   2003.12

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  • (新著紹介小特集「物理入門書の紹介」)「第1回 大学初年級教科書」 Reviewed

    佐藤博彦, 清水敏寛, 黒木和彦, 谷口伸彦

    日本物理学会誌   58 ( 8 )   628 - 631   2003.8

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  • Structure and electronic properties of a nongraphitic disordered carbon system and its heat-treatment effects Reviewed

    K Takai, M Oga, H Sato, T Enoki, Y Ohki, A Taomoto, K Suenaga, S Iijima

    PHYSICAL REVIEW B   67 ( 21 )   214202 - 1-11   2003.6

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    The heat-treatment effect on electronic properties is investigated in relation to structural change for pulsed-laser-deposited amorphous carbon thin films having sp(2)/sp(3) ratio approximate to9. The heat treatment at temperatures 200-400 degreesC increases conductivity and modifies the hopping conduction mechanism at low temperatures, resulting in the generation of a Coulomb gap at E-F. This is attributed to the heat-treatment-induced modification of the disorder nature of the structure from atomic-scale sp(2)/sp(3) disorder to a disordered graphitic sp(2)-domain network by the migration of sp(3) defects. In the heat-treatment temperature region above 600 degreesC, where the structure is featured with graphitic sp(2) domains, considerably small positive thermoelectric power is suggestive of carrier compensation by the competition of hole and electron carriers that originate from the inhomogeneous charge distribution caused by the difference of Fermi levels among graphitic sp(2) domains. In the high-heat-treatment-temperature region 800-1100 degreesC, the formation of an infinite percolation path network of the graphitic sp(2) domains induces an insulator-to-metal transition, where the electron transport in the sp(2)-rich metallic state is featured by weakly temperature-dependent conductivity with majority hole and minority electron carriers.

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  • Critical phenomena in helical magnet beta-MnO2: X-ray magnetic scattering study Reviewed

    H Sato, Y Kawamura, T Ogawa, Y Murakami, H Ohsumi, M Mizumaki, N Ikeda

    PHYSICA B-CONDENSED MATTER   329   757 - 758   2003.5

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    It has been theoretically expected that critical phenomena of helimagnetism is drastically different from those of collinear antiferromagnetism due to the existence of chiral degree of freedom. In order to verify this prediction, we carried out X-ray magnetic scattering measurements on a simplest helimagnet beta-MnO2 using a synchrotron radiation. The critical exponent beta was estimated at 0.25+/-0.05 from the temperature dependence of the scattering intensity. This value is consistent with the predicted value 0.253 for chiral system rather than with 0.346 for collinear system. (C) 2003 Elsevier Science B.V. All rights reserved.

    DOI: 10.1016/S0921-4526(02)02501-2

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  • Drastic effect of water-adsorption on the magnetism of carbon nanomagnets Reviewed

    H Sato, N Kawatsu, T Enoki, M Endo, R Kobori, S Maruyama, K Kaneko

    SOLID STATE COMMUNICATIONS   125 ( 11-12 )   641 - 645   2003.3

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    Activated carbon fibers (ACFs), composed of nanometer-size fragments of graphite (nanographites), show pi-electron-based paramagnetism. Measurements of ESR and magnetic susceptibility revealed that adsorption of water molecules drastically suppresses the paramagnetism of ACFs. Considering also the structural change, this is interpreted in terms of a crossover from a paramagnetic state to a low-spin state of each nanographite due to a structural change of nanographite-network caused by internal pressure of adsorbed water molecules. This phenomenon serves us as a new method for in situ controlling of the condensed state of electrons in soft materials. (C) 2003 Elsevier Science Ltd. All rights reserved.

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  • Magnetism of Nano-graphite Reviewed

    Toshiaki Enoki, Bhagvatula L.V. Prasad, Yoshiyuki Shibayama, Kazuyuki Takai, Hirohiko Sato

    Carbon Alloys: Novel Concepts to Develop Carbon Science and Technology   385 - 394   2003

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    This chapter discusses the magnetism of the nano-sized graphite using-the activated carbon fibers (ACFs) and the heat-treated nano-diamond particles. The structure of ACFs can be described by a 3D disorder network of nanographites, where each nano-graphite domain consists of the stacked 3-4 graphene sheets-having a mean size of 3 nm. The prepared ACFs exhibit Coulomb gap variable-range hopping conduction, revealing the essential role of the charging effects of the nano-graphite domains-where the magnetism is associated with the edge-state spins. The spin-glass-like disordered magnetism appears near a heat-induced insulator-metal transition, and is related to the random strengths of the inter-nano-graphite anti-ferromagnetic interactions-mediated by the p-conduction carriers. Fluorination of the ACFs generates localized spins of the sp3-defects at the expense of the edge-state spins. The heat-treatment of the diamond nano-particles converts them to the carbon nano-particles, with complete graphitization taking place around 1600°C. The itinerant p-electron system of the graphite is gradually developed with the heat-treatment. © 2003 Elsevier B.V. All rights reserved.

    DOI: 10.1016/B978-008044163-4/50023-1

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  • Experimental evidence of a single nano-graphene Reviewed

    A.M. Affoune, B.L.V. Prasad, Hirohiko Sato, Toshiaki Enoki, Yutaka Kaburagi, Yoshihiro Hishiyama

    Chemical Physics Letters   348   17 - 20   2001.10

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  • Structure, Magnetism and Optical Property of Novel Manganese Oxide: BaMn3O6 Reviewed

    Koji Wakiya, Hirohiko Sato, Toshiaki Enoki, Masahiko Isobe, Yutaka Ueda

    Journal of Alloys and Compounds   317-318   115 - 119   2001.6

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  • Structure, magnetism and electrical conductivity of a new ternary manganese oxide: BaMn3O6 Reviewed

    Koji Wakiya, Hirohiko Sato, Akira Miyazaki, Toshiaki Enoki, Masahiko Isobe, Yutaka Ueda

    Journal of Alloys and Compounds   317-318   115 - 119   2001.4

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    The structure, magnetic susceptibility and conductivity of a newly synthesized manganese oxide (BaMn3O6) are reported. Single crystal structure analysis revealed a layered structure. Two types of layers, (I) double layers composed of edge-shared MnO6 octahedra and (II) perovskite-like layers composed of vertex-shared MnO6, are stacked alternatively. All MnO6 octahedra are strongly distorted due to the Jahn-Teller effect. Although the chemical formula BaMn3O6 indicates a mixed-valence state of Mn3+ and Mn4+, the electrical conductivity shows an activation-type temperature dependence, suggesting a semiconductive band structure or Mott-type insulating electronic states. Magnetic susceptibility measurement revealed an antiferromagnetic transition at TN=295 K. Above TN, the magnetic susceptibility exhibits almost temperature-independent behavior. This deviation from molecular-field behavior can be attributed to a large frustration effect originating from the topology of the magnetic-interaction network. © 2001 Elsevier Science B.V.

    DOI: 10.1016/S0925-8388(00)01320-7

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  • Structures and Electronic Properties of Nano-Graphite and its Intercalation Systems

    Toshiaki Enoki, B. L. V. Prasad, A. M. Affoune, Yoshiyuki Shibayama, Hirohiko Sato

    11th International Symposium on Intercalation Compounds   2001.4

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  • STM observation of fluorine-doped graphite surface

    Michinobu Koizumi, Hirohiko Sato, Toshiaki Enoki, Yong-Bo Chong

    11th International Symposium on Intercalation Compounds   2001.4

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  • Guest-controllable magnetism in microporous carbon

    N.Kawatsu, H.Sato, T.Enoki, M.Endo, R.Kobori, S.Maruyama, K.Kaneko

    11th International Symposium on Intercalation Compounds   2001.4

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  • Magnetism of nano-graphite and its assembly Reviewed

    Toshiaki Enoki, Naoki Kawatsu, Yoshiyuki Shibayama, Hirohiko Sato, Roji Kobori, Satoshi Maruyama, Katsumi Kaneko

    Polyhedrons   20 ( 2 )   1311 - 1315   2001.2

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  • Electrophoretic Deposition of Nano-Sized Diamond Particles Reviewed

    A.M. Affoune, B.L.V. Prasad, Hirohiko Sato, Toshiaki Enoki

    Langmuir   17 ( 2 )   547 - 551   2001.2

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  • Magnetic structure of beta-MnO2: X-ray magnetic scattering study Reviewed

    H Sato, K Wakiya, T Enoki, T Kiyama, Y Wakabayashi, H Nakao, Y Murakami

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   70 ( 1 )   37 - 40   2001.1

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    An X-ray scattering experiment using synchrotron radiation has been performed on rutile-type beta -MnO2 single crystal. Below T-N, satellites due to magnetic scattering appear, which provides direct evidence of a helical magnetic structure. The wave number of the magnetic helix is approximately 0.297c*, incommensurate to the lattice and shows very weak temperature dependence. The extinction rule of the satellites is consistent with the magnetic structure proposed by Yoshimori [J. Phys. Sec. Jpn. 14 (1959) 807] in which the nearest helix chains are coupled in an antiferromagnetic way. The temperature dependence of the scattering intensity indicates that the critical exponent beta is anomalously small for an ordinary three dimensional antiferromagnet; this strongly suggests a large chiral degeneracy effect of helical magnetism.

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  • Effect of fluorination on nano-sized pi-electron systems Reviewed

    K Takai, H Sato, T Enoki, N Yoshida, F Okino, H Touhara, M Endo

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   70 ( 1 )   175 - 185   2001.1

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    The electronic structure of networked nano-graphites is investigated in relation to the effects of fluorine-introduced sp(3)-defects on the nano-sized pi -electron system. In the low fluorine concentration region, the shrinkage of the rr-conjugated system due to introduced sp3-defects reduces the orbital diamagnetism and modifies the electron hopping process between nano-graphite domains, and the edge-inherited non-bonding pi -electrons having localized spins, which give a unique feature to nano-sized pi -electron system, are seriously affected by the attack of fluorine atoms to edge carbon sites. In the intermediate fluorine concentration region, the spin density is enhanced by dangling bond spins generated by the local destruction of the pi -conjugated system at interior carbon sites. The hyperfine-broadening of the linewidth and the reduced spin-lattice relaxation rate in ESR spectra suggest the isolated nature of the fluorine-induced localized spins in contrast to the edge-inherited spins.

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  • Intercalated nanographite: Structure and electronic properties Reviewed

    B. L.V. Prasad, Hirohiko Sato, Toshiaki Enoki, Yoshihiro Hishiyama, Yutaka Kaburagi, A. M. Rao, Gamini U. Sumanasekera, P. C. Eklund, A. M. Rao

    Physical Review B - Condensed Matter and Materials Physics   64 ( 23 )   235407 - 1-235407-10   2001

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    Structural and electronic properties of K, (formula presented) and (formula presented) intercalated nanographite compounds, prepared using standard intercalation techniques, were investigated. The staging phenomenon observed in bulk-graphite-intercalation compounds is absent in the case of intercalation compounds of nanographite, as expected for a finite-size host-guest system. K-intercalated samples contain a small fraction of potassium clusters apart from forming homogeneous mixtures of several stages. Many Raman features of K-intercalated nanographite were found to be similar to K-doped single-wall carbon nanotubes. The first evidence of charge transfer from nanographite to iodine, which is absent in bulk graphite, is revealed based on Raman scattering results. The charge transfer per carbon atom (formula presented) follows the order (formula presented) which is similar to the trends observed in bulk-graphite-intercalation compounds. Intercalation of strong donors such as potassium makes the contribution of edge inherited nonbonding π states, which uniquely characterize pristine nanographite, less important. This is explained considering the large charge transfer and the accompanying shift of the Fermi level away from the edge states. In case of weak acceptors such as (formula presented) however, there is an enhancement in density of states that indicates a smaller shift in the Fermi level, keeping it in the vicinity of edge states. © 2001 The American Physical Society.

    DOI: 10.1103/PhysRevB.64.235407

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  • Heat-treatment effect on the nanosized graphite π-electron system during diamond to graphite conversion Reviewed

    B. L.V. Prasad, Hirohiko Sato, Toshiaki Enoki, Yoshihiro Hishiyama, Yutaka Kaburagi, A. M. Rao, P. C. Eklund, Kyoichi Oshida, Morinobu Endo

    Physical Review B - Condensed Matter and Materials Physics   62 ( 16 )   11209 - 11218   2000.10

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    Graphite nanoparticles were prepared by the heat treatment of diamond nanoparticles in the range 900-1600 °C. X-ray diffraction, transmission electron microscopy (TEM) and Raman scattering studies indicate that the onset temperature of the diamond-graphite transition is around 1200 °C and the complete conversion of diamond to graphite occurs at 1600 °C. Based on the structural characteristics the samples are categorized into sp3-dominated (as-prepared and 900 °C), sp2:sp3 mixed-phase (1200 and 1400 °C), and sp2-dominated systems (1600 °C). The larger c-axis repeat distances and the high-resolution TEM images for the sp2:sp3 mixed-phase systems denote the presence of the remnant buckling feature of the diamond (111) planes in the graphene sheets. Magnetic susceptibility and ESR studies suggest the development of itinerant-π-electron system from the 1200 °C and higher-temperature heat-treated samples. The completely graphitized sample reveals the important role of edge-inherited nonbonding π-electron states in the electronic structure. The Raman G-peak position and the orbital diamagnetism show considerable deviation from the bulk-graphite values, which is explained on the basis of charge transfer from the graphite π band to the localized edge states and the resulting shifting of the Fermi level. The enhanced spin-lattice relaxation rates in the case of more graphitized samples heat-treated at 1400 and 1600 °C are expected to arise from the involvement of the localized edge-state electrons. In the less-graphitized 1200 °C heat-treated sample, however, the corrugated nature of the graphene planes is likely to hinder such fast-relaxation processes. © 2000 The American Physical Society.

    DOI: 10.1103/PhysRevB.62.11209

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  • Heat-treatment effect on the nanosized graphite pi-electron system during diamond to graphite conversion Reviewed

    BLV Prasad, H Sato, T Enoki, Y Hishiyama, Y Kaburagi, AM Rao, K Oshida, M Endo

    PHYSICAL REVIEW B   62 ( 16 )   11209 - 11218   2000.10

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    Graphite nanoparticles were prepared by the heat treatment of diamond nanoparticles in the range 900-1600 degreesC. X-ray diffraction, transmission electron microscopy (TEM) and Raman scattering studies indicate that the onset temperature of the diamond-graphite transition is around 1200 degreesC and the complete conversion of diamond to graphite occurs at 1600 degreesC. Based on the structural characteristics the samples are categorized into sp(3)-dominated (as-prepared and 900 degreesC), sp(2):sp(3) mixed-phase (1200 and 1400 degreesC), and sp(2)-dominated systems (1600 degreesC). The larger c-axis repeat distances and the high-resolution TEM images for the sp2:sp3 mixed-phase systems denote the presence of the remnant buckling feature of the diamond (111) planes in the graphene sheets. Magnetic susceptibility and ESR studies suggest the development of itinerant-pi -electron system from the 1200 degreesC and higher-temperature heat-treated samples. The completely graphitized sample reveals the important role of edge-inherited nonbonding pi -electron states in the electronic structure. The Raman G-peak position and the orbital diamagnetism show considerable deviation from the bulk-graphite values, which is explained on the basis of charge transfer from the gaphite pi band to the localized edge states and the resulting shifting of the Fermi level. The enhanced spin-lattice relaxation rates in the case of more graphitized samples heat-treated at 1400 and 1600 degreesC are expected to arise from the involvement of the localized edge-state electrons. In the less-graphitized 1200 degreesC heat-treated sample, however, the corrugated nature of the graphene planes is likely to hinder such fast-relaxation processes.

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  • Dimensional crossover and angular dependent magnetoresistance of magnetic graphite intercalation compounds; MCl2 GIC's (M=Cu and Co) Reviewed

    H Sato, OE Andersson, T Enoki, IS Suzuki, M Suzuki

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   69 ( 4 )   1136 - 1144   2000.4

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    In order to consider the dimensionality and the interaction between conduction electrons and localized magnetic moments, angular dependences of the magnetoresistance of magnetic GIC's, stage-1, and stage-a MCl2 GIC's (M=Cu and Co) were measured. The c-axis (perpendicular to the graphite layers) resistance of stage-1 CuCl2 GIC shows a typical angular dependent magnetoresistance oscillation (ADMRO) which is commonly observed in several quasi two-dimensional (2D) electron systems with a periodically-warped cylindrical Fermi surface. This proves a band conduction along the c-axis in spite of extremely large anisotropy in conductivity (rho(c)/rho(a) = 10(5)). On the other hand, stage-a CoCl2 GIC shows a larger MR for the magnetic field along tilt? c axis than that along the graphitic plane. In addition, ADMRO is absent in this compound. These suggest that the c-axis conduction is governed by incoherent interlayer hoppings. The angular dependence of MR in stage-2 CuCl2 and stage-1 CoCl2 GIC's show an intermediate behavior between that of stage-1 CuCl2 GIC and stage-2 CoCl2 GIC.-The above material-dependence is attributed to the difference in interlayer coupling and suggests a dimensional crossover From a highly anisotropic three-dimensional (3D) system (stage-l CuCl2 GIG) to an almost pure 2D system (stage-a CoCl2 GIG). The c-axis resistances of stage-1 and stage-a CoCl2 GIC's reflect also the magnetic states of Co spins. This phenomenon is explained in terms of a model based on spin-dependent tunneling effect.

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  • Novel electronic properties of a nano-graphite disordered network and their iodine doping effects Reviewed

    Y Shibayama, H Sato, T Enoki, XX Bi, MS Dresselhaus, M Endo

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   69 ( 3 )   754 - 767   2000.3

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    Activated carbon fibers (ACFs) are microporous carbons consisting of a three-dimensional disordered network of nano-graphites with a mean in-plane size of about 30 Angstrom. We investigated the structure, electronic properties and iodine doping effects for ACF samples heat-treated up to 2800 degrees C. The samples heat-treated below 1000 degrees C exhibit Coulomb gap variable-range hopping conduction and the presence of localized spins, suggesting the importance of charging effects and the edge-inherited non-bonding states in nano-graphites, the latter being predicted theoretically. Iodine doping reduces the charging effect due to the dielectric constant enhanced by the iodine that is accommodated in the micropores. Heat treatment above 1300 degrees C changes ACFs from an Anderson insulator to a disordered metal by the development of an infinite inter-nano-graphite percolation path network for electron transport, accompanied by a change from localized-spin magnetism to itinerant electron magnetism. In the metallic regime, carrier scattering is subjected to nano-graphite boundaries in terms of a short range random potential. Iodine-doping introduces ionized impurity scattering, which is caused by the I-3(-) ions generated by the charge transfer from iodine to nano-graphite.

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  • Disordered magnetism at the metal-insulator threshold in nano-graphite-based carbon materials Reviewed

    Y Shibayama, H Sato, T Enoki, M Endo

    PHYSICAL REVIEW LETTERS   84 ( 8 )   1744 - 1747   2000.2

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    The magnetism of activated carbon fibers composed of a disorder network of nanographites was investigated, where each nanographite has about 1 edge-inherited localized spin. The susceptibility, for samples situated around the metal-insulator threshold, shows a cusp around 4-7 K in addition to the presence of a field-cooling effect. These behaviors are explained in terms of disordered magnetism caused by random strengths of inter-nano-graphite antiferromagnetic interactions mediated by pi-conduction carriers.

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  • Transport properties and magnetism of a helically Hund-coupled conductor: beta-MnO2 Reviewed

    H Sato, T Enoki, M Isobe, Y Ueda

    PHYSICAL REVIEW B   61 ( 5 )   3563 - 3569   2000.2

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    Transport properties and magnetic susceptibility have been investigated for single crystals of the magnetic conductor beta-MnO2. Resistivity, Hall coefficient, and thermoelectric power reveal the behavior of n-type metal with an anomalously small mobility. The transport properties are accompanied by a large anomaly around T-N(approximate to 92 K) below which a helical magnetic long-range order forms. This indicates that the e(g) conduction electrons, originating from a slight off-stiochiometry, are strongly coupled with localized magnetic moments in the t(2g) orbitals by means of Hund's rule. Below T-N, the magnetoresistance shows a large anisotropy reflecting the helical magnetic structure. Below about 50 K, the mobility gradually decreases, suggesting a carrier localization. The anisotropic measurement of magnetic susceptibility on a single crystal reveals the behavior of proper-type helical magnetism qualitatively, but shows a significant deviation from a molecular-field analysis based on a localized spin model.

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  • I-129 Mossbauer effect of iodine absorbed in activated carbon fibers Reviewed

    Y Shibayama, H Sato, T Enoki, M Seto, Y Kobayashi, Y Maeda, M Endo

    MOLECULAR CRYSTALS AND LIQUID CRYSTALS   340   301 - 306   2000

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    Activated carbon fibers (ACFs) composed of a nano-graphite disordered network have huge specific surface areas ranging 1000-3000m(2)g(-1). The electronic states of iodine adsorbed in ACFs were investigated by I-129 Mossbauer spectroscopy with a focus on charge transfer from nano-graphite to iodine. The observed spectra consisting of five different quadrupole octets demonstrate the coexistence of I-3(-) ion and I-2 molecule in micropores. This fact implies that I-3(-) ions are produced as a result of charge transfer from nano-graphite to iodine. The estimated charge transfer rate on the basis of the ratio of generated I-3(-) is in good agreement with the previous results obtained by magnetic susceptibility.

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  • Anomalous angular dependence of magnetoresistance in MCl2-GIC's (M=Cu and Co) Reviewed

    H Sato, T Enoki, IS Suzuki, M Suzuki

    MOLECULAR CRYSTALS AND LIQUID CRYSTALS   340   19 - 24   2000

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    Angular dependence of the c-axis magnetoresistance of stage-1 and stage-2 MCl2 GIC (M=Cu and Co) was measured. Stage-1 CuCl2 GIC shows an angular dependent magnetoresistance oscillation (ADMRO) characteristic in the systems having a periodically-warped cylindrical Fermi surface (FS), This means that the conduction along the c-axis is band-like in spite of extremely large anisotropy in conductivity. On the other hand, the angular dependence of the magnetoresistance of stage-2 CuCl2 GIC and stage-1 CoCl2 GIC can be interpreted as the mixture of ADMRO based on a band conduction and incoherent interlayer hopping. Stage-2 CoCl2 GIC shows only incoherent hopping. In low magnetic field region, the c-axis resistances of stage-1 and stage-2 CoCl2 GIC are affected by the magnetic phase transitions. Spin-dependent tunneling effect can explain this phenomenon.

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  • Successive magnetic phase transitions of CucCo1-cCl2-FeCl3 graphite bi-intercalation compounds Reviewed

    IS Suzuki, M Suzuki, H Sato, T Enoki

    MOLECULAR CRYSTALS AND LIQUID CRYSTALS   340   107 - 112   2000

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    CucCo1-cCl2-FeCl3 graphite bi-intercalation compounds (GBIC's) have a c-axis stacking sequence of -G-I-1-G-I-2-G-I-1-G-I-2-G- (G = graphite layer, I-1 = CucCo1- Cl-c(2) layer, and I-2 = FeCl3 layer). These compounds undergo magnetic phase transitions at T-h, T-cu, T-cl, T-SG, and T-RSG (T-h>T-cl>T(RSG)approximate to T-SG), depending on the Cu concentration. The phase transition at Th is related to a helical spin order. The phase transitions at T-cu and T-cl are associated with a spin order of CucCo1-cCl2 layers. The re-entrant spin glass phase below T-RSG for c less than or equal to 0.4 and the spin glass phase below T-SG far c greater than or equal to 0.5 are due to the spin frustration effect occurring in FeCl3 layers. The nature of these phases has been studied using SQUID DC magnetization and SQUID AC magnetic susceptibility.

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  • Fluorine-introduced sp(3)-carbon sites in a nano-sized pi-electron system and their effects on the electronic properties Reviewed

    K Takai, H Sato, T Enoki, N Yoshida, F Okino, H Touhara, M Endo

    MOLECULAR CRYSTALS AND LIQUID CRYSTALS   340   289 - 294   2000

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    Activated carbon fibers (ACFs) are microporous systems comprised of a random network of nano-sized graphites. We investigated the structure and electronic properties of fluorinated ACFs in order to clarify the effects of fluorine-introduced sp(3)-carbon sites on the electronic state of the nano-sized pi-electron system. The orbital diamagnetism is monotonically reduced with increasing F/C, suggesting that introduced sp(3) carbon sites make the extended n-conjugated system reduced. In the intermediate fluorine concentration region, the localized spin concentration is enhanced by fluorination, reaching a maximum at F/C similar to 0.8, whereas it tends to be lowered in the high concentration region. The enhancement in the spin concentration is explained in terms of the local destruction of the pi-conjugated system at interior carbon sites by fluorine-inherited sp(3)-carbon sites.

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  • Nano-graphites and their potassium intercalated compounds: Structural and electronic properties Reviewed

    BLV Prasad, H Sato, T Enoki, Y Hishiyama, Y Kaburagi

    MOLECULAR CRYSTALS AND LIQUID CRYSTALS   340   793 - 798   2000

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    Graphite-nano particles were prepared by the heat-treatment of diamond-nano particles. Various heat-treatment temperatures in the range 900-1600 degrees C were used. X-ray diffraction studies indicate that the onset temperature of diamond-graphite transition is around 1000 degrees C and the complete conversion of diamond to graphite occurs at 1600 degrees C. X-ray diffraction studies on the potassium intercalated compounds of these graphite-nano particles, while indicating the absence of staging phenomenon, show that small neutral potassium clusters are included in these intercalated compounds. The presence of neutral potassium clusters could also explain the observed magnetic susceptibilities and the large deviations in the ESR g-values of these intercalated nano-graphitic systems.

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  • Charge localization and successive magnetic phase transitions of mixed-valence manganese oxides K-1.5(H3O)(x)Mn8O16 (0 < x < 0.5) Reviewed

    H Sato, T Enoki, JI Yamaura, N Yamamoto

    PHYSICAL REVIEW B   59 ( 20 )   12836 - 12841   1999.5

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    Magnetism and transport properties are reported for hollandite-type manganese oxides K-1.5(H3O)(x)Mn8O16 (0<x<0.5) having a tunnel structure. Three phase transitions are observed at T-1 (varies from 180 to 250 K, very sensitive to the synthetic condition), at T-2 (52 K) and at T-3 (20 K). The conductivity and the thermoelectric power indicate that the electric conduction above T-1 is governed by the hopping of small polarons and that the polarons begin to be trapped at a part of Mn sites below T-1. The magnetic susceptibility suggests that the T-1 transition is a phase transition from a single-spin system (T>T-1) composed of only S approximate to 1.63 spins, to a multispin system composed of S=2 spins and S=3/2 spins. These observations strongly suggest that T-1 is a kind of a charge-localization transition of Mn4+ and Mn3+. Magnetic susceptibility also reveals that a weak ferromagnetism appears between T-2 and T-3 and disappears again below T-3. From the anisotropy of the magnetic susceptibility, the ground state is considered to be a helical magnetism. [S0163-1879(99)09219-X].

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  • Copper(II) complexes of a novel ligand 4,5-dicyanoimidazole: structural and magnetic studies Reviewed

    BLV Prasad, H Sato, T Enoki, S Cohen, TP Radhakrishnan

    JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS   ( 1 )   25 - 29   1999.1

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    The potential use of 4,5-dicyanoimidazolate ion (DCI-) as a bridging ligand for magnetically interesting co-ordination polymers has been explored. New Cu-II-bipy complexes containing DCI- were prepared and characterised: crystal structure analysis revealed DCI- co-ordinated Cu-II in one of the complexes. The ESR and magnetic susceptibility studies showed that the compounds are nearly Curie paramagnetic or weakly antiferromagnetic. A polymeric structure is proposed for one of the complexes.

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  • Host-guest systems in microporous carbons Reviewed

    T Enoki, K Takai, Y Shibayama, N Kobayashi, A Nakayama, H Sato, N Yoshida, H Touhara

    SOLID STATE IONICS V   548   3 - 14   1999

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    Microporous activated carbon fibers (ACF) having huge specific surface areas are characterized as a three-dimensional network of nano-sized graphite domains. We investigate ACF-hosting host-guest systems aiming at novel phenomena produced by the host-guest interface interactions. An extraordinarily large amount of helium is condensed in the ACF micropores, suggesting the presence of ultra-micropores and the enhancement in the helium-nano-graphite interaction. Chemisorbed oxygen molecules are stabilized in the singlet states caused by the interaction with nano-graphite and it makes the micorpore volume swell. Iodine forms an intercalation system with nano-graphites through charge transfer process, in contrast with the behavior of bulk graphite that does not accept iodine as an acceptor-type intercalate. Fluorine reacting with nano-graphite generates dangling bond spins by breaking graphite pi-bonds, where the fluorine-induced defect is found to have a widely extended electronic structure.

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  • Charge localization and successive magnetic phase transitions of mixed-valence manganese oxides (formula presented) (formula presented) Reviewed

    Hirohiko Sato, Toshiaki Enoki

    Physical Review B - Condensed Matter and Materials Physics   59 ( 20 )   12836 - 12841   1999

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    Magnetism and transport properties are reported for hollandite-type manganese oxides (Formula presented) (Formula presented) having a tunnel structure. Three phase transitions are observed at (Formula presented) (varies from 180 to 250 K, very sensitive to the synthetic condition), at (Formula presented) (52 K) and at (Formula presented) (20 K). The conductivity and the thermoelectric power indicate that the electric conduction above (Formula presented) is governed by the hopping of small polarons and that the polarons begin to be trapped at a part of Mn sites below (Formula presented) The magnetic susceptibility suggests that the (Formula presented) transition is a phase transition from a single-spin system (Formula presented) composed of only (Formula presented) spins, to a multispin system composed of (Formula presented) spins and (Formula presented) spins. These observations strongly suggest that (Formula presented) is a kind of a charge-localization transition of (Formula presented) and (Formula presented) Magnetic susceptibility also reveals that a weak ferromagnetism appears between (Formula presented) and (Formula presented) and disappears again below (Formula presented) From the anisotropy of the magnetic susceptibility, the ground state is considered to be a helical magnetism. © 1999 The American Physical Society.

    DOI: 10.1103/PhysRevB.59.12836

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  • Structure and electronic properties of graphite nanoparticles Reviewed

    OE Andersson, BLV Prasad, H Sato, T Enoki, Y Hishiyama, Y Kaburagi, M Yoshikawa, S Bandow

    PHYSICAL REVIEW B   58 ( 24 )   16387 - 16395   1998.12

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  • Oxygen Effects on Microporous Activated Carbon Fibers

    H.Sato, Y.Yoshikawa, T.Enoki, M.Endo

    Extended Abstract of Int. Symp. on Carbon, Nov. 9-12 (1998), Tokyo, Japan   390 - 391   1998.11

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  • Structure and Properties of Fluorinated Activated Carbon Fibers

    Naohiko Yoshida, o

    Extended Abstract of Int. Symp. on Carbon, Nov. 9-12 (1998), Tokyo, Japan   478 - 479   1998.11

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  • Superconductivity in new organic conductor kappa-(BEDSe-TTF)(2)CuN(CN)(2)Br Reviewed

    J Sakata, H Sato, A Miyazaki, T Enoki, Y Okano, R Kato

    SOLID STATE COMMUNICATIONS   108 ( 6 )   377 - 381   1998

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    Superconductivity is discovered in new type of two-dimensional organic metal kappa-(BEDSe-TTF)(2)CuN(CN)(2)Br consisting of BEDT-TTF donor analogue having selenium-substituted six-member outer rings. This salt is isostructural to the corresponding BEDT-TTF salt and shows metallic behavior accompanied with a spin-density-wave transition at TMI-25K. The application of pressure up to 0.15 GPa generates superconducting state at T-c = 7.5 K, which is lower than T-c of the BEDT-TTF salt (T-c = 11.6 K). The lowering of T-c and the modification in the electronic structure are explained in terms of the important contribution of selenium electrons and the concomitant enhancement in donor dimerization. (C) 1998 Elsevier Science Ltd. All rights reserved.

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  • The c-axis magnetoresistance and thermoelectric power of CuCl(2) graphite intercalation compounds Reviewed

    Odd E. Andersson, Hirohiko Sato, Toshiaki Enoki, Masatsugu Suzuki, Itsuko S. Suzuki

    MOLECULAR CRYSTALS AND LIQUID CRYSTALS SCIENCE AND TECHNOLOGY SECTION A-MOLECULAR CRYSTALS AND LIQUID CRYSTALS   310   249 - 254   1998

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    CuCl(2) graphite intercalation compounds (GICs) having CuCl(2) magnetic intercalate layers are expected to give novel magnetic layer effect on their transport phenomena, through the pi-d interaction. We investigate the transport properties of stage 1-4 CuCl(2) GIG by means of c-axis magnetoresistance (MR) and thermoelectric powers. In stage-1 compound, anomalously large MR is observed for the field perpendicular to the c-axis, indicating a remarkable difference in the magnetic field direction dependence horn that of in-plane MR governed by the cyclotron motion of the carriers. This implies the important role of the magnetic layers in the c-axis hopping process. The c-axis thermoelectric power shows an anomalous change around 70-100 K where a short range order hump appears in the magnetic susceptibility.

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  • Magnetic Properties of Activated Carbon Fibers and Their Iodine-Doping Effect Reviewed

    Yoshiyuki Shibayama, Hirohiko Sato, Toshiaki Enoki, Morinobu Endo, Norifumi Shindo

    MOLECULAR CRYSTALS AND LIQUID CRYSTALS SCIENCE AND TECHNOLOGY SECTION A-MOLECULAR CRYSTALS AND LIQUID CRYSTALS   310   273 - 278   1998

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    Activated carbon fibers (ACFs) are microporous carbons consisting of a three-dimensional disordered network of micrographites. In order to clarify the correlation between the disordered structure and the electronic properties, we investigated the magnetic susceptibility of heat-treated and iodine-doped ACFs. The heat treatment reduced the Fermi energy of ACFs, but the carrier density per micrographite estimated from the Fermi energy is nearly equal to the density of dangling bond spins of as-prepared ACFs, irrespective of heat treatment temperature. In less graphitized ACFs, a charge transfer arises from ACFs to iodine, suggesting less graphitized micrographite has the electronic features of condensed polycyclic aromatic hydrocarbons. On the other hand, well graphitized micrographites in ACFs, are more graphitic in their electronic state, resulting in the absence of charge transfer to iodine.

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  • Successive magnetic phase transitions in CucCo1-cCl2-FeCl3 GBICs Reviewed

    IS Suzuki, M Suzuki, H Sato, T Enoki

    SOLID STATE COMMUNICATIONS   104 ( 10 )   581 - 585   1997.12

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    CucCo1-cCl2-FeCl3 GBICs (0 less than or equal to c less than or equal to 1) undergo magnetic phase transitions at T-c1, T-c2 and T-c3 (T-c3 < T-c2 < T-c1) depending on the Cu concentration. The phase transitions at T-c1 and T-c3 show spin glass behaviors. The phase transitions at T-c2 and T-c3 are related to the in-plane spin orders of CucCo1-cCl2 layers and FeCl3 layers, respectively. The spin orders in the CucCo1-cCl2 layers and the FeCl3 layers are coupled to each other through an interplanar exchange interaction, leading to the appearance of phase transition at T-c1 and the decrease of T-c2 with increasing Cu concentration. (C) 1997 Published by Elsevier Science Ltd.

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  • Magnetism and electron transport phenomena of manganese oxide ion exchanger with tunnel structure Reviewed

    H Sato, J Yamaura, T Enoki, N Yamamoto

    JOURNAL OF ALLOYS AND COMPOUNDS   262   443 - 449   1997.11

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    Conductivity, thermoelectric power (TEP) and magnetic susceptibility of the tunnel-type manganese oxides K1.5Mn8O16 are reported. The conductivity and the TEP around room temperature suggest that the electrical conduction is governed by hopping of small-polarons. Three phase transitions are observed at T-1 (varies from 175 K to 215 K, batch-dependent), at T-2 (52 K) and at T-3 (20 K). The T-1 transition is considered to be a charge-ordering transition of Mn4+ and Mn3+ coupled with the ordering of the potassium ions in the tunnels. Weak ferromagnetism appears between T-2 and T-3 and disappears again below T-3. The anisotropic measurement of the susceptibility strongly suggests the occurrence of a helical magnetism below T-3. After the single crystals are soaked in cone. HNO3 for a few days, a part of the potassium ions in the tunnels are removed. Besides, the activation energy is drastically reduced and the T-1 transition is suppressed. This suggests that the charge-ordering of Mn4+ and Mn3+ is very sensitive to the state of the tunnel cations. (C) 1997 Elsevier Science S.A.

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  • Highly anisotrspic superconductivity in the organic conductor alpha-(BEDT-TTF)(2)NH4Hg(SCN)(4) Reviewed

    H Taniguchi, H Sato, Y Nakazawa, K Kanoda

    PHYSICAL REVIEW B   53 ( 14 )   R8879 - R8882   1996.4

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    Superconductivity in a layered organic compound, alpha-(BEDT-TTF)(2)NH4Hg(SCN)(4), has been characterized by measurements of the in-plane and out-of-plane resistivities and susceptibilities. The anisotropy of the normal state resistivity amounts to 10(5)-10(6). The profiles of the in-plane and out-of-plane superconducting transitions are qualitatively different in both resistive and inductive measurements. The out-of-plane penetration depth is as long as 1.4 mm. All these results indicate that this material is a model system of Josephson-coupled two-dimensional layers with a high superconductive anisotropy,

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  • Highly anisotrspic superconductivity in the organic conductor alpha-(BEDT-TTF)(2)NH4Hg(SCN)(4)

    H. Taniguchi, H. Sato, Y. Nakazawa, K. Kanoda

    Physical Review B   53 ( 14 )   R8879 - R8882   1996

  • SPECIFIC-HEAT STUDY OF ALPHA-(BEDT-TTF)(2)MHG(SCN)(4) Reviewed

    Y NAKAZAWA, H SATO, A KAWAMOTO, K KANODA

    SYNTHETIC METALS   70 ( 1-3 )   943 - 944   1995.3

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    The low-temperature specific heat of alpha-phase of (BEDT-TTF)(2)MHg(SCN)(4) (M=K, Rb, NH4), where BEDT-TTF is bis(etylenedithio) tetrathiafulvalene, is studied. The electronic specific heat coefficient (gamma) estimated from the data between 1K and 2.3K amounts to 5.3, 10.3, 28.8mJ/mol K-2 for M=K, Rb and NH4, respectively. The K-salt does not have distinct anomally around 8K within the precision of our experiments, implying that the transition occurs with a gradual change of electronic structure.

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  • ELECTRONIC-STATE OF KAPPA-(BMDT-TTF)(2)AU(CN)2 STUDIED BY NMR AND THERMOELECTRIC MEASUREMENTS Reviewed

    K MIYAGAWA, H SATO, A KAWAMOTO, K KANODA, T MORI

    SYNTHETIC METALS   70 ( 1-3 )   879 - 880   1995.3

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    The electronic state of kappa-(BMDT-TTF)(2)Au(CN)(2) was investigated by measurements of H-1-NMR and thermoelectric power. In H-1-NMR, the profile of the nuclear relaxation curve changed drastically at 75 K from exponential time-dependence to non-single exponential one reflecting inhomogeneous relaxation. This change evidences a transition in the electronic state at this temperature. However, the longest T-1 below the transition temperature behaves like a Korringa law, suggesting that the low-temperature state is another metallic state. The thermoelectric power shows a strong anomaly around 75 K,being consistent with the NMR results. Above that, the temperature dependence is similar to that found in the K phase of BEDT-TTF compounds, suggesting a similar Fermi-surface topology. These results suggest that the transition at 75 K is not a conventional metal-to-insulator transition but a metal-to-metal transition.

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  • Resistive Transition in an Extremely Two-Dimensional Superconductor, α-(BEDT-TTF)2NH4Hg(SCN)4 Reviewed

    Hirohiko Sato, Hiromi Taniguchi, Yasuhiro Nakazawa, Atsushi Kawamoto, Kiyonori Kato, Kazushi Kanoda

    Synth. Metals   70   915 - 916   1995.3

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  • COMPLEX SUSCEPTIBILITY AND PENETRATION DEPTH OF BEDT-TTF BASED LAYERED SUPERCONDUCTORS Reviewed

    Y NAKAZAWA, H SATO, A KAWAMOTO, K KATO, K KANODA

    SYNTHETIC METALS   70 ( 1-3 )   919 - 920   1995.3

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    We have obtained the parallel penetration depth of two representative compounds of layered organic superconductors, kappa-(BEDT-TTF)(2)Cu[N(CN)(2)]Br and alpha-(BEDT-TTF)(2)NH4(SCN)(4) by ac susceptibility measurements. The former salt gives the depth of 190 mu m, while that for the latter is 1.4 mm. These values demonstrate that the NH4(SCN)(4) salt is more highly-two-dimensional than the Cu[N(CN)(2)]Br salt. The ac susceptibility under dc magnetic field probes peculiarities of the vortex dynamics.

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  • STRUCTURAL AND PHYSICAL-PROPERTIES OF THETA-(BEDT-TTF)(2)CU-2(CN)[N(CN)(2)](2) Reviewed

    T KOMATSU, H SATO, N MATSUKAWA, T NAKAMURA, H YAMOCHI, G SAITO, M KUSUNOKI, K SAKAGUCHI, S KAGOSHIMA

    SYNTHETIC METALS   70 ( 1-3 )   779 - 780   1995.3

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    The title compound was obtained during the crystal growth of two kappa-type superconductors, kappa-(BEDT-TTF)(2)Cu(CN)[N(CN)(2)] and kappa'-(BEDT-TTF)(2) Cu-2(CN)(3). This compound is a magnetic semiconductor, whose spin susceptibility is expressed by quadratic-layer Heisenberg antiferromagnet model (QLAF) between 32.6K and 220K. At 220K, a semiconductor-semiconductor transition into a high conductivity phase was observed by transport measurements.

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  • THE ELECTRICAL AND MAGNETIC-PROPERTIES OF A NOVEL 2-DIMENSIONAL ANTIFERROMAGNET BASED ON BEDT-TTF - THETA-(BEDT-TTF)(2)CU-2(CN)[N(CN)(2)](2) Reviewed

    T KOMATSU, H SATO, T NAKAMURA, N MATSUKAWA, H YAMOCHI, G SAITO, M KUSUNOKI, K SAKAGUCHI, S KAGOSHIMA

    BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN   68 ( 8 )   2233 - 2244   1995

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    A crystal-structure analysis and a band calculation, as well as conductivity, thermoelectric power, ESR, and static susceptibility measurements were performed on the new BEDT-TTF salt, theta-(BEDT-TTF)(2)Cu-2(CN)[N(CN)(2)](2). This salt has a unique polymerized anion comprising infinite Cu-N(CN)(2)-Cu double helices bridged by disordered CN groups. Although the two-dimensional arrangement of crystallographically equivalent BEDT-TTF+0.5 cations provides a two-dimensional closed Fermi surface within the tight-binding approximation, this salt is semiconductive even at room temperature, probably due to a strong electron correlation in this system. A semiconductor-semiconductor transition has been observed around 220 K. Below 220 K the electronic system is represented as a Mott insulator and a two-dimensional Heisenberg antiferromagnet. Rapid decreases in the ESR line width and spin susceptibility below 50 K indicate the existence of an additional magnetic transition.

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  • STRUCTURAL PHASE-TRANSITIONS OF THE QUASI-2-DIMENSIONAL METAL (K1-XRBX)3CU8S6 - X-RAY-SCATTERING STUDIES Reviewed

    H SATO, N KOJIMA, S KAGOSHIMA

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   62 ( 6 )   2051 - 2061   1993.6

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    A quasi two-dimensional metal K3Cu8S6 has two phase transitions at T1 (153 K) and at T2 (55 K), accompanied by an incommensurate (between T1 and T2) and a commensurate (below T2) superstructures, respectively. On the other hand, the resistivity of Rb3Cu8S6, which is isostructural with K3Cu8S6, suggests that Rb3Cu8S6 has only the T1 transition. In order to investigate the superstructures of Rb3Cu8S6, X-ray diffuse scattering studies were carried out. The results show that an incommensurate superstructure with a wave vector of (0 eta 0), eta congruent-to 0.45, appears between T1 and the measuring lowest temperature (about 15 K). The temperature dependence of the intensity of the superstructure is that of an ordinary charge-density wave and there is no evidence for the T2 transition in Rb3Cu8S6. The X-ray scattering results on the mixed crystals (K1-xRbx)3Cu8S6 are also reported.

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  • STUDY ON CARRIERS AND CHARGE-DENSITY-WAVE TRANSITIONS OF 2-DIMENSIONAL METALS (K1-XRBX)3CU8S6, (RB1-XCSX)3CU8S6, K3CU8(S1-XSEX)6, AND RB3CU8(S1-XSEX)6 Reviewed

    H SATO, N KOJIMA

    SYNTHETIC METALS   56 ( 2-3 )   2731 - 2736   1993.4

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    A quasi two-dimensional metal K3Cu8S6 undergoes two kinds of phase transitions at T1 (153K) and at T2 (55K), attended by an incommensurate (IC) and a commensurate superstructures, respectively. In order to investigate these phase transitions, the mixed crystals (K1-xRbx)3Cu8S6, (Rb1-xCsx)3Cu8S6, K3Cu8(S1-xSex), and Rb3Cu8(S1-xSex) have been synthesized and their transport properties have been studied. Their resistivities show that the T1 transition of K3CU8S6, assigned as onset transition of an IC charge-density wave (CDW), is slightly affected by the substitution of alkali atoms but strongly suppressed by the substitution of chalcogen atoms. Their thermoelectric powers suggest that the existence of n-type carriers is essential for the CDW transition. On the other hand, the T2 transition of K3Cu8S6, whose origin is not clear, is suppressed by Rb doping and by Se doping.

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  • EFFECTS OF ALKALI SUBSTITUTION AND PRESSURE ON THE CHARGE-DENSITY WAVE TRANSITIONS OF 2-DIMENSIONAL METALS K3CU8S6 AND RB3CU8S6 Reviewed

    H SATO, N KOJIMA, K SUZUKI, T ENOKI

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   62 ( 2 )   647 - 658   1993.2

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    K3Cu8S6 is a two-dimensional metal which has two phase transitions at T1 (153 K) and T2 (55 K), accompanied by an incommensurate and a commensurate superstructure, respectively. In order to investigate these phase transitions, the mixed crystals (K1-xRbx)3Cu8S6 have been synthesized and the effect of the alkali substitution and that of pressure have been studied by the measurements of their transport properties. With increasing x, T1 significantly decreases, reaching T1 of Rb3Cu8S6 (= 110 K). Pressure also reduces T1 of K3Cu8S6 and Rb3Cu8S6. On the other hand, the T2 transition becomes obscure with increasing x, and disappears thoroughly for x greater-than-or-equal-to 0.50. In Rb3Cu8S6, the T2 transition is absent at ambient pressure but induced by the pressure of at most 0.5 GPa. Around x = 0.06, a remarkable rise in the resistivity appears below T2. Its mechanism is discussed.

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  • PHASE-DIAGRAM OF THE 3-DIMENSIONAL HALOGEN-BRIDGED MIXED-VALENCE COMPOUNDS-M2AU2X6(M=RB, CS, X=CL,BR,I) UNDER HIGH-PRESSURE Reviewed

    N KOJIMA, A TANAKA, H SATO, H KITAGAWA, T KIKEGAWA, O SHIMOMURA

    JAPANESE JOURNAL OF APPLIED PHYSICS, VOL 32, SUPPLEMENT 32-1   Jan-32   51 - 53   1993

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  • Study on Carriers and Charge-Density Wave Transitions of Two-Dimensional Metals (K1-xRbx)3Cu8S6, K3Cu8(S1-xSex)6 and Rb3Cu8(S1-xSex)6. Reviewed

    H. Sato, N. Kojima

    Synthetic Metals   56   1726 - 1729   1993

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  • ELECTRONIC-PROPERTIES OF LOW-DIMENSIONAL TERNARY COPPER CHALCOGENIDES A-CU-X (A=NA,K,RB,CS - X=S,SE) Reviewed

    H SATO, N KOJIMA

    PHOSPHORUS SULFUR AND SILICON AND THE RELATED ELEMENTS   67 ( 1-4 )   361 - 366   1992

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  • Successive Phase Transitions in the Three-Dimensional Halogen Bridged Mixed-Valence Compound Rb2Au2I6 under High Pressures

    A.Tanaka, H.Sato, N.Kojima, T.Kikegawa, O.Shimomura

    Proc. XIII AIRAPT Int. Conf. High Pressure Science and Technology, Oct. 7-11 (1991), Bangalore, India   193 - 195   1991.10

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  • METALLIZATION AND PHASE-TRANSITIONS OF THE 3-DIMENSIONAL HALOGEN-BRIDGED MIXED-VALENCE COMPLEX CS2AU2I6 UNDER HIGH-PRESSURE Reviewed

    H KITAGAWA, H SATO, N KOJIMA, T KIKEGAWA, O SHIMOMURA

    SOLID STATE COMMUNICATIONS   78 ( 11 )   989 - 995   1991.6

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    We have recently shown that insulating mixed-valence complex Cs2Au2I6 transforms gradually to a metallic state between ambient pressure and 4.5 GPa at room temperature. Also shown that Cs2Au2I6 undergoes a metal-to-metal transition in a process of increasing temperature at 6.5 GPa. The present energy-dispersive X-ray diffraction study has revealed that Cs2Au2I6 undergoes a pressure-induced first-order tetragonal-to-tetragonal phase transition at about 5.5 GPa and room temperature. At the transition pressure, the Au-Au distance elongates along the c-axis, which is due to the 'band Jahn-Teller' transition. The Au(II) valence state is considered to be realized at this pressure. This phase transition would relate to the minimum in the pressure-resistance curve near 5.5 GPa, previously reported. It was also found that Cs2Au2I6 undergoes a first-order tetragonal-to-cubic phase transition at 6.8 GPa and T approximately 350 K.

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  • STRUCTURE-ANALYSIS OF HIGH-PRESSURE METALLIC STATE OF THE 3-DIMENSIONAL MIXED-VALENCE COMPOUND CS2AUIAUIIII6 BY X-RAY-DIFFRACTION USING SR Reviewed

    H KITAGAWA, H SATO, N KOJIMA, T KIKEGAWA, O SHIMOMURA

    SYNTHETIC METALS   42 ( 1-2 )   1953 - 1956   1991.5

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    The present energy-dispersive X-ray diffraction study has revealed that Cs(z)Au2I6 undergoes a pressure-induced first-order tetragonal-tetragonal phase transition at about 5.5 GPa and room temperature. At the transition pressure, the Au-Au distance elongates along the c-axis. This phase transition would relate to the resistance minimum at 5.4 GPa, previously reported [1]. It was also found that Cs(z)Au(z)I6 undergoes a first-order tetragonal-cubic phase transition at 6.5 GPa and T approximately 350 K.

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  • HYDROSTATIC-PRESSURE EFFECT ON THE CHARGE-DENSITY WAVE TRANSITION IN THE LOW-DIMENSIONAL METAL K3CU8S6 Reviewed

    H SATO, E IGAKI, T NAKAMURA, T BAN, N KOJIMA

    SOLID STATE COMMUNICATIONS   71 ( 10 )   793 - 795   1989.9

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Books

  • 工学基礎電磁気学: 0 (新・工科系の物理学 TKP-3)

    佐藤 博彦( Role: Sole author)

    数理工学社  2019.9  ( ISBN:4864810621

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    Total pages:243   Language:Japanese  

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  • 理工学の基礎としての力学

    ( Role: Sole author)

    培風館  2016.3 

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    Total pages:141   Responsible for pages:141   Language:Japanese   Book type:Scholarly book

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  • 大学院物理化学 下巻「固体の電子状態」

    佐藤 博彦( Role: Joint author)

    講談社サイエンティフィク  1992.1 

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    Responsible for pages:684-698   Language:Japanese   Book type:Scholarly book

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MISC

  • 「固体物理学」

    佐藤博彦

    日本大百科全書   2005.6

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  • 「分子磁石」

    宮原将平, 佐藤博彦

    日本大百科全書   2005.6

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  • 「反磁性体」

    宮原将平, 佐藤博彦

    日本大百科全書   2005.6

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  • 「磁気モーメント」

    宮原将平, 佐藤博彦

    日本大百科全書   2005.6

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  • 「磁気」

    宮原将平, 佐藤博彦

    日本大百科全書   2005.6

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  • 「磁化」

    宮原将平, 佐藤博彦

    日本大百科全書   2005.6

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Presentations

  • 三角格子反強磁性体Mn(OH)2における逐次磁気相転移

    大寺翔也, 佐藤博彦, 鳴海康雄, 萩原政幸, 竹内徹也

    日本物理学会 2019年秋季大会  2019.9  日本物理学会

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  • 三角格子ハイゼンベルク反強磁性体NaCrO2の単結晶の合成と磁化の異方性測定

    田口諒一, 佐藤博彦

    日本物理学会 2019年秋季大会  2019.9  日本物理学会

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  • 新規磁性体RCoGeO5(R=La,Pr,Nd)の構造と磁性

    波多野達貴, 浅賀樹, 佐藤博彦

    日本物理学会 2019年秋季大会  2019.9  日本物理学会

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  • 新規磁性体K2V6GeO16の構造と磁性

    中山武尊, 工藤菜央, 佐藤博彦

    日本物理学会 2019年秋季大会  2019.9  日本物理学会

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  • 水熱合成法による斜方晶系YMnO3の単結晶成長と誘電特性の測定

    中野智仁, 佐藤博彦, 寺田典樹

    日本物理学会 2019年秋季大会  2019.9  日本物理学会

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  • ホイスラー系化合物の単結晶育成

    増渕伸一, 大岩潔, 福原忠, 並木孝洋, 佐藤博彦

    日本物理学会 2019年秋季大会  2019.9  日本物理学会

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  • ホイスラー系化合物のNMR

    大岩潔, 増渕伸一, 福原忠, 並木孝洋, 佐藤博彦

    日本物理学会 2019年秋季大会  2019.9  日本物理学会

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  • ホイスラー系化合物単結晶の伝導と化学組成

    福原忠, 増渕伸一, 大岩潔, 並木孝洋, 佐藤博彦

    日本物理学会 2019年秋季大会  2019.9  日本物理学会

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  • Ni-Mn-Sb新規化合物の構造と物性

    増渕伸一, 大岩潔, 福原忠, 並木孝洋, 佐藤博彦

    日本物理学会 第74年次大会  2019.3  日本物理学会

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  • Mnを過剰に含むNiMnSbの磁性と伝導

    福原忠, 増渕伸一, 大岩潔, 並木孝洋, 佐藤博彦

    日本物理学会 第74年次大会  2019.3  日本物理学会

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  • Ni-Mn-Sb新規化合物のNMR II

    大岩潔, 増渕伸一, 福原忠, 並木孝洋, 佐藤博彦

    日本物理学会 第74年次大会  2019.3  日本物理学会

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  • RbMn3Ge2O9新規S=2カゴメ格子酸化物の構造と磁性

    原茂生, 佐藤博彦, 櫻井敬博, 大久保晋, 太田仁

    日本物理学会 第74年次大会  2019.3  日本物理学会

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  • 新規ペロブスカイト型Ru酸化物A3MgRu2O9 (A = Ca, Sr)の構造, 磁性及び電子輸送現象

    相賀拓郎, 佐藤博彦

    日本物理学会 2018年秋季大会  2018.9  日本物理学会

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  • アニール法で作製したNi-Mn-Sb新規化合物の構造と物性 II

    増渕伸一, 岩瀬文達, 大岩潔, 福原忠, 神谷洋平, 佐藤博彦

    日本物理学会 2018年秋季大会  2018.9  日本物理学会

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  • アニール法で作製したNi-Mn-Sb新規化合物の組成と密度

    神谷洋平, 福原忠, 増渕伸一, 岩瀬文達, 大岩潔, 佐藤博彦

    日本物理学会 2018年秋季大会  2018.9  日本物理学会

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  • アニール法により作製したNi-MnSb新規化合物のNMRII

    大岩潔, 増渕伸一, 岩瀬文達, 福原忠, 神谷洋平, 佐藤博彦

    日本物理学会 2018年秋季大会  2018.9  日本物理学会

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  • Sc-T-Sn (T=Co, Rh)の45Sc-NMR

    岩瀬文達, 増渕伸一, 大岩潔, 福原忠, 佐藤博彦

    日本物理学会 2018年秋季大会  2018.9  日本物理学会

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  • 層状構造を持つ新規Ni含有マンガン酸化物の合成と磁性測定

    笠井駿, 佐藤博彦

    日本物理学会 2018年秋季大会  2018.9  日本物理学会

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  • Rb-Mn-Ge-O系新規物質の探索

    原茂生, 佐藤博彦, 櫻井敬博, 大久保晋, 太田仁

    日本物理学会 2018年秋季大会  2018.9  日本物理学会

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  • 単結晶を用いた菱面体晶および六方晶AgFeO2の磁気秩序と誘電分極の探査

    寺田典樹, Dmitry D. Khalyavin, Pascal Manuel, Fabio Orlandi, 池戸優太, 佐藤博彦

    日本物理学会 第73回年次大会  2018.3  日本物理学会

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  • 強磁性パイエルス絶縁体としての新規マンガン酸化物AMg4Mn6O15(A = K, Rb, Cs)

    山口伴紀, 杉本高大, 太田幸則, 田中雄大, 佐藤博彦

    日本物理学会 第73回年次大会  2018.3  日本物理学会

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  • 混合原子価マンガン酸化物K2Mg4Mn6O15のμSR

    岡部博孝, 平石雅俊, 竹下聡史, 幸田章宏, 小嶋健児, 門野良典, 田中雄大, 佐藤博彦

    日本物理学会 第73回年次大会  2018.3  日本物理学会

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  • ミュオンで見たルチル型らせん磁性体MnO2の磁気構造と局所電子状態

    門野良典, 岡部博孝, 平石雅俊, 幸田章宏, 小嶋健児, 竹下聡史, 山内一宏, 佐藤博彦

    日本物理学会 第73回年次大会  2018.3  日本物理学会

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  • アニール法により作製したNi-Mn-Sb新規化合物の構造と物性

    増渕伸一, 岩瀬文達, 大岩潔, 福原忠, 神谷洋平, 清水文比古, 佐藤博彦

    日本物理学会 第73回年次大会  2018.3  日本物理学会

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  • アニール法により作製したNiMnSb単結晶の電気抵抗

    神谷洋平, 福原忠, 岩瀬文達, 増渕伸一, 大岩潔, 清水文比古, 佐藤博彦

    日本物理学会 第73回年次大会  2018.3  日本物理学会

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  • アニール法によって合成された強磁性体Ni-Mn-SbのNMR

    岩瀬文達, 増渕伸一, 大岩潔, 福原忠, 神谷洋平, 清水文比古, 佐藤博彦

    日本物理学会 第73回年次大会  2018.3  日本物理学会

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  • アニール法により作製したNi-Mn-Sb新規化合物のNMR

    大岩潔, 増渕伸一, 岩瀬文達, 福原忠, 神谷洋平, 清水文比古, 佐藤博彦

    日本物理学会 第73回年次大会  2018.3  日本物理学会

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  • 新規2次元酸化物磁性体のX-band ESR測定

    原茂生, 佐藤博彦, 櫻井敬博, 大久保晋, 太田仁

    日本物理学会 第73回年次大会  2018.3  日本物理学会

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  • Co正方格子のESR測定

    下城世那, 高橋昭彦, 吉田翔太, Khalif, 齋藤佑, 原茂生, 櫻井敬博, 大久保晋, 太田仁, 佐藤博彦

    日本物理学会 2017年秋季大会  2017.9 

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  • C1b型TMnSb(T=Ni, Pt Cu)単結晶のNMR V

    大岩潔, 増渕伸一, 岩瀬文達, 福原忠, 清水文比古, 佐藤博彦

    日本物理学会 2017年秋季大会  2017.9 

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  • アニール法によるTMnSb(T=Ni,Pd,Pt,Cu,Co)単結晶の育成およびその物性

    増渕伸一, 岩瀬文達, 大岩潔, 福原忠, 清水文比古, 佐藤博彦

    日本物理学会 2017年秋季大会  2017.9 

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  • ペロブスカイト型Mn酸化物YMn1-xMgxO3の構造と磁性

    下田拓也, 佐藤博彦

    日本物理学会 2017年秋季大会  2017.9 

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  • Cr2(MoO4)3の単結晶作成と磁性測定

    石井雄大, 佐藤博彦

    日本物理学会 2017年秋季大会  2017.9 

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  • 新規マンガン酸化物AMg4Mn6O15(A = K, Rb, and Cs)の電子状態

    山口伴紀, 杉本高大, 太田幸則, 田中雄大, 佐藤博彦

    日本物理学会 2017年秋季大会  2017.9 

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  • ペロブスカイト型ルテニウム酸化物 Sr(Ru1-xMgx)O3の構造と磁性

    相賀拓郎, 佐藤博彦

    日本物理学会 2017年秋季大会  2017.9 

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  • 二種類の三角格子をもつ磁性体Co2MoO6の強磁場磁化

    脇本聖美, 佐藤博彦, 松尾晶, 金道浩一

    日本物理学会 2017年秋季大会  2017.9 

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  • フラストレーション系スピングラス物質KV14Ge2O27のスローダイナミクス

    工藤菜央, 原田景, 佐藤博彦

    日本物理学会 2017年秋季大会  2017.9 

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  • 非イオン性混合原子価バナジウム8核酸化物クラ|rn|スター錯体の合成

    井上裕太, 小玉晋太朗, 佐藤博彦, 石井洋一

    錯体化学会 第67回討論会  2017.9 

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  • アニール法によるNiMnSb単結晶の育成およびその物性 I

    増渕伸一, 岩瀬文達, 大岩潔, 福原忠, 並木孝洋, 清水文比古, 佐藤博彦

    日本物理学会 第72年次大会  2017.3 

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  • アニール法によるNiMnSb単結晶の育成およびその物性 II

    岩瀬文達, 増渕伸一, 大岩潔, 福原忠, 並木孝洋, 清水文比古, 佐藤博彦

    日本物理学会 第72年次大会  2017.3 

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  • フラストレート磁性体K2Mn3(OH)2(VO4)2のESR測定II

    藤本雅哉, 大久保晋, 原茂生, 櫻井敬博, 太田仁, 大塚大佑, 佐藤博彦

    日本物理学会 第72年次大会  2017.3 

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  • 様々な方法で作製したNiMnSb単結晶の物性

    増渕伸一, 岩瀬文達, 大岩潔, 倉田祥平, 福原忠, 並木孝洋, 清水文比古, 佐藤博彦

    日本物理学会2016年秋季大会  2016.9 

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  • ホランダイト構造を基本とするバナジウム酸化物K2-xV8+2xO16+xの構造と物性

    工藤菜央, 佐藤博彦

    日本物理学会2016年秋季大会  2016.9 

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  • 新規コバルト酸化物Co2MoO6の構造と磁性

    脇本聖美, 佐藤博彦

    日本物理学会2016年秋季大会  2016.9 

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  • 三角格子反強磁性体NaFeO2の磁場中単結晶中性子回折実験

    寺田典樹, D. D. Khalyavin, P. Manuel, 池戸優太, 佐藤博彦

    日本物理学会2016年秋季大会  2016.9 

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  • フラストレート磁性体K2Mn3(OH)2(VO4)2のESR測定

    藤本雅哉, 大久保晋, 原茂生, 櫻井敬博, 太田仁, 大塚大祐, 佐藤博彦

    日本物理学会2016年秋季大会  2016.9 

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  • マイカ構造を有する新規化合物KFe3Ge4O12の構造と磁性

    千代田彩果, 小野慎介, 佐藤博彦

    日本物理学会2016年秋季大会  2016.9 

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  • 新規強磁性マンガン酸化物AMg4Mn6O15(A=K, Rb, Cs)の構造と磁性

    田中雄大, 佐藤博彦

    日本物理学会2016年秋季大会  2016.9 

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  • 新規一次元磁性体Mg3MnO6Hxの構造と磁性

    加賀聖守, 佐藤博彦

    日本物理学会2016年秋季大会  2016.9 

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  • 新規ダブルタングステン酸塩AgFe(WO4)2の構造と磁性

    高本亘, 佐藤博彦

    日本物理学会2016年秋季大会  2016.9 

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  • フラストレート磁性体AV3Mo3O11 (A=Na, K) の強磁場磁化

    石井雄大, 佐藤博彦, 松尾晶, 金道浩一

    日本物理学会2016年秋季大会  2016.9 

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  • Magnetic and structural properties of a new mica-type compound KFe3Ge4O12

    Ayaka Chiyoda, Shinsuke Ono, Hirohiko Sato

    20th International Conference on Solid Compounds of Transition Elements  2016.4 

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  • Structure and magnetism of a new one-dimensional magnet Mg3MnO6Hx

    Kiyomori Kaga, Hirohiko Sato

    20th International Conference on Solid Compounds of Transition Elements  2016.4 

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  • Structure and magnetism of a new double tungstate AgFe(WO4)2

    Wataru Takamoto, Eijiro Ohta, Hirohiko Sato

    20th International Conference on Solid Compounds of Transition Elements  2016.4 

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  • Structure and magnetism of a new manganese oxide KMg4Mn6O15

    Yudai Tanaka, Hirohiko Sato

    20th International Conference on Solid Compounds of Transition Elements  2016.4 

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  • C1b型およびZrCuSi2型金属間化合物の溶融塩フラックスによる単結晶作製

    増渕伸一, 大岩潔, 福原忠, 清水文比古, 佐藤博彦

    日本物理学会第71回年次大会  2016.3 

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  • 水熱合成による単結晶Sr2NiGe2O7の単結晶育成と磁化の異方性測定

    原茂生, 佐藤博彦, 櫻井敬博, 太田仁, 西郡至誠

    日本物理学会第71回年次大会  2016.3 

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  • 強磁性相互作用と反強磁性相互作用が共存する三角格子系CoxMn1-x(OH)2の合成と磁性

    稲葉岳, 佐藤博彦

    日本物理学会第71回年次大会  2016.3 

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  • 新規フラストレート磁性体Na2V2Mo3O11の構造と磁性

    石井雄大, 佐藤博彦

    日本物理学会第71回年次大会  2016.3 

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  • フラストレート磁性体K2Mn3(OH)2(VO4)2の強磁場磁化

    大塚大祐, 佐藤博彦, 中村大輔, 嶽山正二郎, 松尾晶, 金道浩一

    日本物理学会第71回年次大会  2016.3 

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  • マルチフェロイック三角格子反強磁性体3R-AgFeO2とα-NaFeO2の単結晶作成と強磁場物性

    池戸優太, 佐藤博彦, 金道浩一, 松尾晶, 徳永将史, 三宅厚志, 寺田典樹

    日本物理学会2015年秋季大会  2015.9 

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  • 新規フラストレート磁性体Rb2Mn3V2O10の構造と磁性

    大塚大祐, 佐藤博彦

    日本物理学会2015年秋季大会  2015.9 

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  • 新規スピングラス物質KV14Ge2O27の構造と磁性

    原田景, 佐藤博彦

    日本物理学会2015年秋季大会  2015.9 

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  • 水熱合成による単結晶M2NiGe2O7(M=Sr,Ba)の単結晶育成と磁化の異方性測定

    原茂生, 佐藤博彦, 櫻井敬博, 太田仁

    日本物理学会2015年秋季大会  2015.9 

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  • Single-crystal growth and magnetic properties of|rn|multiferroic triangular-lattice antiferromagnet|rn|3R-AgFeO2 and

    Yuta Ikedo, Hirohiko Sato, Akira Matsuo, Koichi Kindo, Masashi Tokunaga, Atsushi Miyake, Noriki Terada

    20th International Conference on Magnetism  2015.7 

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  • Single-crystal growth and magnetic properties|rn|of new frustrated magnet, Rb2Mn3(OH)2(VO4)2

    Daisuke Otsuka, Hirohiko Sato

    20th International Conference on Magnetism  2015.7 

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  • New spin glass material, KV14Ge2O27

    Kei Harada, Hirohiko Sato

    International Conference on Magnetism  2015.7 

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  • 新規Co系1次元鎖酸化物の構造と磁性

    原茂生, 佐藤博彦, 櫻井敬博, 太田仁

    日本物理学会2014年秋季大会  2014.9 

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  • 三角格子反強磁性体α-NaFeO2の単結晶作成と磁化の異方性

    池戸優太, 佐藤博彦

    日本物理学会2014年秋季大会  2014.9 

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  • S=1カゴメ格子反強磁性体KV3Ge2O9の低温構造

    高木瑛午, 原茂生, 佐藤博彦, 木村剛, 若林裕助

    日本物理学会2014年秋季大会  2014.9 

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  • フラストレート磁性体K2Mn3(OH)2(VO4)2の単結晶作成と磁化測定

    大塚大祐, 佐藤博彦

    日本物理学会2014年秋季大会  2014.9 

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  • Structural study of a new Bi-V-O compound: Bi17V3Ox

    Kei Harada, Hirohiko Sato

    19th International Conference on Solid Compounds of Transition Elements  2014.6 

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  • Magnetic properties of K2Mn3(OH)2(VO4)2

    Daisuke Otsuka, Hirohiko Sato

    19th International Conference on Solid Compounds of Transition Elements  2014.6 

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  • Structure and magnetism of a novel compound, Co2Cu(SO4)2(OH)2

    Yuki Nagao, Hirohiko Sato, Shigeo Hara

    19th International Conference on Solid Compounds of Transition Elements  2014.6 

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  • 金属間化合物LaAu1-xCuxSb2の構造とCDW転移

    増渕伸一, 石井康之, 大岩潔, 福原忠, 清水文比古, 佐藤博彦

    日本物理学会第69回年次大会  2014.3 

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  • 新規磁性体Co2Cu(SO4)2(OH)2の構造と磁性

    長尾有紀, 原茂生, 佐藤博彦

    日本物理学会第69回年次大会  2014.3 

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  • 新規Mo系3量体化カゴメ格子酸化物の構造と磁性

    原茂生, 佐藤博彦, 櫻井敬博, 太田仁

    日本物理学会第69回年次大会  2014.3 

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  • S=1カゴメ格子反強磁性体KV3Ge2O9の強磁場ESR測定

    高本圭祐, 中田亮平, 張衛民, 大久保晋, 太田仁, 櫻井敬博, 原茂生, 佐藤博彦

    日本物理学会第68回年次大会  2013.3 

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  • Cu3(MoO4)2(OH)2の単結晶育成と磁化の異方性測定

    原茂生, 佐藤博彦

    日本物理学会第68回年次大会  2013.3 

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  • Cr-JarositeのESR測定III

    中田亮平, 高橋直己, 下川統久朗, 櫻井敬博, 張衛民, 大久保晋, 太田仁, 奥田浩司, 原茂生, 佐藤博彦

    日本物理学会第68回年次大会  2013.3 

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  • Rb-Ge-V-O系新規物質の探索と磁性

    原茂生, 佐藤博彦

    日本物理学会2012年秋季大会  2012.9 

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  • Cr-JarositeのESR測定II

    中田亮平, 高橋直己, 櫻井敬博, 張衛民, 大久保晋, 太田仁, 奥田浩司, 原茂生, 佐藤博彦

    日本物理学会2012年秋季大会  2012.9 

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  • 数値的厳密対角化法を用いた正四面体スピンCo4B6O13の磁気励起現象の研究

    白椽大, 萩原弘幸, 佐藤博彦, 益田隆嗣

    日本物理学会2012年秋季大会  2012.9 

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  • 金属間化合物RTSb2(R=La,Ce,Pr;T=Ag)の構造とNMR

    増渕伸一, 石井康之, 小林義彦, 大岩潔, 福原忠, 清水文比古, 佐藤博彦

    日本物理学会第67回年次大会  2012.3 

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  • 三本鎖磁性体Cu3(OH)4SO4の1H-NMR

    石川裕也, 藤井裕, 菊池彦光, 原茂生, 佐藤博彦

    日本物理学会第67回年次大会  2012.3 

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  • 正四面体スピンCo4B6O13の非弾性中性子散乱

    白椽大, 萩原弘幸, 佐藤博彦, 益田隆嗣

    日本物理学会第67回年次大会  2012.3 

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  • S=3/2かごめ格子反強磁性体Cr-jarositeの単結晶NMRによるスピン構造の研究

    西山昌秀, 猪原崇生, 小山田明, 伊藤哲明, 前川覚, 奥田浩司, 佐藤博彦

    日本物理学会第67回年次大会  2012.3 

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  • 一次元反強磁性体Cu3(OH)4SO4の単結晶試料における強磁場ESR測定 II

    大久保晋, 高橋直己, 櫻井敬博, 太田仁, 菊池彦光, 原茂生, 佐藤博彦

    日本物理学会第67回年次大会  2012.3 

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  • TlFe2Se2のバルク敏感光電子分光II

    西谷嘉人, 東谷篤志, 藤原秀紀, 木須孝幸, 関山明, 寺島健成, 今田真, 玉作賢治, 矢橋牧名, 石川哲也, 菅滋正, 入澤明典, 室隆桂之, 堀口悟志, 佐藤博彦, 梅山規男, 宮川宣明, 池田伸一, 小堀裕己, 山崎篤志

    日本物理学会第67回年次大会  2012.3 

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  • 新規S=1 kagome格子反強磁性体の発見とその特異な磁性

    原茂生, 佐藤博彦

    日本物理学会第67回年次大会  2012.3 

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  • TlFe2Se2の元素置換効果

    梅山規男, 八木翔太, 堀口悟史, 佐藤博彦, 原嘉昭, 藤井武則, 常盤和靖, 高瀬浩一, 束田昭雄, 宮川宣明, 池田伸一

    日本物理学会2011年秋季大会  2011.9 

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  • Fe2(OH)[B2O4(OH)]の構造と磁性

    倉吉陽太郎, 原茂生, 佐藤博彦

    日本物理学会2011年秋季大会  2011.9 

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  • 二次元強磁性体RbCr(SO4)2の単結晶作成と磁性測定

    加藤知光, 原茂生, 佐藤博彦

    日本物理学会2011年秋季大会  2011.9 

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  • K-Si-V-O系新規物質の探索と磁性

    原茂生, 佐藤博彦

    日本物理学会2011年秋季大会  2011.9 

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  • s=3/2かごめ格子反強磁性体Cr-jarosite単結晶のNMR

    西山昌秀, 猪原崇生, 小山田明, 伊藤哲明, 前川覚, 奥田浩司, 佐藤博彦

    日本物理学会2011年秋季大会  2011.9 

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  • 一次元反強磁性体Cu3(OH)4SO4の単結晶試料における強磁場ESR測定

    高橋直己, 大久保晋, 櫻井敬博, 太田仁, 菊池彦光, 原茂生, 佐藤博彦

    日本物理学会2011年秋季大会  2011.9 

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  • TlFe2Se2のバルク敏感光電子分光

    西谷嘉人, 東谷篤志, 入澤明典, 室隆桂之, 堀口悟志, 佐藤博彦, 梅山規男, 宮川宣明, 池田伸一, 小堀裕己, 山崎篤志

    日本物理学会2011年秋季大会  2011.9 

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  • パイロクロア酸化物Ca2Ru2O7の圧力効果

    谷口年史, 槙坂光太郎, 藤井敦大, 近藤忠, 寺田俊彦, 佐藤博彦

    日本物理学会2011年秋季大会  2011.9 

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  • 単結晶を用いた三本鎖磁性体Cu3(OH)4SO4の1H-NMR II

    石川裕也, 藤井裕, 菊池彦光, 原茂生, 佐藤博彦

    日本物理学会2011年秋季大会  2011.9 

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  • 新規三角格子系Na2BaMV2O8(M=Co,Ni)の合成と磁性

    中山元希, 原茂生, 佐藤博彦

    日本物理学会2011年秋季大会  2011.9 

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  • 金属間化合物RTSb2(R=La,Ce,Pr; T=Ag)の構造とCDW転移

    増渕伸一, 石井康之, 小林義彦, 大岩潔, 福原忠, 清水文比古, 佐藤博彦

    日本物理学会2011年秋季大会  2011.9 

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  • TlFe2-xMxSe2(M = Co, Ni)の合成と磁性

    梅山規男, 八木翔太, 堀口悟史, 佐藤博彦, 原嘉昭, 藤井武則, 常盤和靖, 高瀬浩一, 宮川宣明, 池田伸一

    日本物理学会第66回年次大会  2011.3 

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  • C1b型XMnSb(X=Ni,Pd,Pt)単結晶のNMRIV

    大岩潔, 増渕伸一, 小林義彦, 並木孝洋, 福原忠, 清水文比古, 佐藤博彦

    日本物理学会第66回年次大会  2011.3 

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  • Mg-V-O系スピネルの単結晶育成とその磁性

    原茂生, 大島祐之, 松田崇弘, 池田伸一, 渡辺忠孝, 富安啓輔, 佐藤博彦

    日本物理学会第66回年次大会  2011.3 

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  • かごめ格子反強磁性体Cr-jarositeの単結晶NMRにおける磁気異方性

    西山昌秀, 小山田明, 伊藤哲明, 前川覚, 奥田浩司, 佐藤博彦

    日本物理学会第66回年次大会  2011.3 

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  • 単結晶を用いた三本鎖磁性体Cu3(OH)4SO41H-NMR

    石川裕也, 藤井裕, 菊池彦光, 原茂生, 佐藤博彦

    日本物理学会第66回年次大会  2011.3 

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  • TlFe2Se2のTlサイトに対する置換効果

    八木翔太, 梅山規男, 堀口悟史, 佐藤博彦, 原嘉昭, 藤井武則, 束田昭雄, 宮川宣明, 池田伸一

    日本物理学会第66回年次大会  2011.3 

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  • TlFe2Se2-δの圧力効果

    寺井達哉, 久田旭彦, 田中斗志貴, 松林和幸, 上床美也, 堀口悟史, 佐藤博彦, 梅山規男, 原嘉昭, 高瀬浩一, 宮川宣明, 池田伸一

    日本物理学会2010年秋季大会  2010.9 

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  • 鉄系超伝導体FeSeのバルク敏感光電子分光

    松井陽平, 山崎篤志, 小堀裕己, 杉村陽, 今田真, 寺嶋健成, 美馬一馬, 宮田裕大, 山口良輔, 室隆桂之, 加藤有香子, 高瀬浩一, 東秀幸, 梅山規男, 佐藤博彦, 原嘉昭, 宮川宣明, 池田伸一

    日本物理学会2010年秋季大会  2010.9 

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  • Cr-Jarositeの強磁場磁化の異方性

    奥田浩司, 佐藤博彦, 鳴海康雄, 金道浩一

    日本物理学会2010年秋季大会  2010.9 

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  • C1b型XMnSb(X=Ni, Pd, Pt)単結晶のNMRIII

    大岩潔, 並木孝洋, 小林義彦, 増渕伸一, 福原忠, 清水文比古, 佐藤博彦

    日本物理学会2010年秋季大会  2010.9 

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  • 金属間化合物La(TxT'1-x)Sb2の磁性と輸送特性

    増渕伸一, 並木孝洋, 小林義彦, 大岩潔, 福原忠, 清水文比古, 地引宏和, 佐藤博彦

    日本物理学会2010年秋季大会  2010.9 

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  • かごめ格子反強磁性体Cr-jarositeの単結晶NMR

    西山昌秀, 小山田明, 伊藤哲明, 前川覚, 奥田浩司, 佐藤博彦

    日本物理学会2010年秋季大会  2010.9 

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  • 新規Ni2-δSO5の磁化の異方性

    高橋美咲, 原茂生, 佐藤博彦

    日本物理学会2010年秋季大会  2010.9 

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  • Geを含む新規層状Cr酸化物の合成とスピングラス磁性の測定

    小川慎太郎, 奥田浩司, 佐藤博彦

    日本物理学会2010年秋季大会  2010.9 

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  • Cu-Mo-O系新規物質の探索

    原茂生, 佐藤博彦

    日本物理学会2010年秋季大会  2010.9 

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  • TlFe2Se2-δの合成と電気伝導性

    堀口悟史, 佐藤博彦, 梅山規男, 原嘉昭, 宮川宣明, 高瀬浩一, 池田伸一

    日本物理学会2010年秋季大会  2010.9 

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  • ねじれ正三角量子スピンチューブ系候補物質の合成と磁性測定の試み

    鈴木裕太, 原茂生, 佐藤博彦

    日本物理学会2010年秋季大会  2010.9 

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  • 金属間化合物LaAg1-xAuxSb2の構造と磁性及び輸送現象測定

    大庭森太郎, 風間重雄, 佐藤博彦, 大石克嘉, 増渕伸一, 小林義彦, 福原忠, 清水文比古

    日本物理学会第65年次大会  2010.3 

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  • La1-xEuxCoO3(x=0~1.0)の結晶構造と磁性

    内田雅大, 小林義彦, 佐藤博彦, 大石克嘉, 増渕伸一, 浅井吉蔵, 風間重雄

    日本物理学会第65年次大会  2010.3 

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  • 遊星ボールミルを用いた鉄系超伝導FeSeの試料作成

    東秀幸, 金子遊三, 前田稔, 渡辺忠孝, 高野良紀, 梅山規男, 原嘉昭, 原茂夫, 佐藤博彦, 宮川宣明, 池田伸一, 高瀬浩一, 吉田芙美子, 森吉千佳子, 黒岩芳弘

    日本物理学会第65年次大会  2010.3 

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  • Cu3SO4(OH)4単結晶の高磁場磁化測定

    原茂生, 近藤弘基, 鳴海康雄, 金道浩一, 佐藤博彦

    日本物理学会第65年次大会  2010.3 

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  • Ag含有カルコゲナイド化合物の合成と超伝導特性

    富永あやか, 梅山規男, 原嘉昭, 佐藤博彦, 池田伸一

    日本物理学会2009年秋季大会  2009.9 

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  • C1b型CoVSbの磁性

    大岩潔, 並木孝洋, 小林義彦, 増渕伸一, 福原忠, 清水文比古, 佐藤博彦, 風間重雄

    日本物理学会2009年秋季大会  2009.9 

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  • 新規Ni-S-O系の単結晶作成と磁性測定

    高橋美咲, 原茂生, 佐藤博彦

    日本物理学会2009年秋季大会  2009.9 

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  • A2Cu(CO3)2 (A=Na,K)の単結晶作成と磁化測定

    鈴木裕太, 原茂生, 佐藤博彦

    日本物理学会2009年秋季大会  2009.9 

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  • フラックス法によるY-(Ni,Pd,Pt)-Sn系における金属間化合物の探索II

    増渕伸一, 並木孝洋, 小林義彦, 大岩潔, 福原忠, 清水文比古, 佐藤博彦, 風間重雄

    日本物理学会2009年秋季大会  2009.9 

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  • Bi-Re-O三元系酸化物の合成と磁性及び電気伝導性の測定

    堀口悟史, 原茂生, 佐藤博彦, 池田伸一, 梅山規男

    日本物理学会2009年秋季大会  2009.9 

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  • パイロクロア型ルテニウム酸化物Ca2Ru2O7の電子輸送現象

    寺田俊彦, 佐藤博彦

    日本物理学会2009年秋季大会  2009.9 

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  • 層状オキシプニクタイド(LaO)FeAsの精密構造解析

    加藤甲馬, 高瀬浩一, 岡崎祐真, 森吉千佳子, 黒岩芳弘, 梅山規男, 佐藤博彦, 原嘉昭, 宮川宣明, 池田伸一, 渡辺忠孝, 高野良紀

    日本物理学会2009年秋季大会  2009.9 

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  • FeSe超伝導体の単結晶作成の試み

    梅山規男, 原嘉昭, 堀口悟史, 富永あやか, 原茂夫, 佐藤博彦, 高瀬浩一, 宮川宣明, 池田伸一

    日本物理学会2009年秋季大会  2009.9 

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  • Cu3(SO)4(OH)2の単結晶育成と磁化の異方性測定

    原茂生, 近藤弘基, 佐藤博彦

    日本物理学会2009年秋季大会  2009.9 

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  • FeSeの軟X線光電子分光II

    松井陽平, 山崎篤志, 小堀裕己, 杉村陽, 高瀬浩一, 今田真, 美馬一馬, 室隆桂之, 加藤有香子, 梅山規男, 佐藤博彦, 原嘉昭, 宮川宣明, 池田伸一

    日本物理学会2009年秋季大会  2009.9 

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  • 水熱法による新規Cr酸化物の合成とスピングラス磁性の測定

    小川慎太郎, 奥田浩司, 佐藤博彦

    日本物理学会2009年秋季大会  2009.9 

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  • スピン四面体を含むCo4B6O13の超低温領域における磁化と磁場中比熱

    萩原弘幸, 佐藤博彦, 鳴海康雄, 金道浩一

    日本物理学会2009年秋季大会  2009.9 

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  • Cr-Jarositeの単結晶作成と強磁場磁化測定

    奥田浩司, 佐藤博彦, 鳴海康雄, 金道浩一

    日本物理学会2009年秋季大会  2009.9 

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  • 幾何学的フラストレート系GeCo2O4の単結晶中性子非弾性散乱によるスピン励起測定

    富安啓輔, 富永あやか, 原茂生, 佐藤博彦, 渡辺忠孝, 池田伸一, 岩佐和晃, 山田和芳

    日本物理学会2009年秋季大会  2009.9 

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  • フラックス法によるY-(Ni,Pd,Pt)-Sn系における金属間化合物の探索

    増渕伸一, 小林義彦, 大岩潔, 福原忠, 清水文比古, 佐藤博彦, 風間重雄

    日本物理学会第64回年次大会  2009.3 

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  • FeSeの軟X線光電子分光

    山崎篤志, 岡賢太郎, 松井陽平, 矢内彰雄, 高瀬浩一, 東秀幸, 加藤甲馬, 今田真, 美馬一真, 室隆桂之, 加藤有香子, 梅山規男, 佐藤博彦, 原嘉昭, 宮川宣明, 池田伸一

    日本物理学会第64回年次大会  2009.3 

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  • Ru(Rh)を含む新規物質探索の試み

    中村俊季, 梅山規男, 佐藤博彦, 池田伸一

    日本物理学会第64回年次大会  2009.3 

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  • FeSe超伝導体の焼結温度依存性

    梅山規男, 高瀬浩一, 堀口悟史, 富永あやか, 佐藤博彦, 原嘉昭, 宮川宣明, 池田伸一

    日本物理学会第64回年次大会  2009.3 

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  • 気相法により成長したFeSe結晶の構造と物性

    原嘉昭, 高瀬浩一, 山崎篤志, 佐藤博彦, 宮川宣明, 梅山規男, 池田伸一

    日本物理学会第64回年次大会  2009.3 

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  • ホーランダイト型酸化物K2Cr8O16における金属-絶縁体転移

    長谷川邦洋, 礒部正彦, 山内徹, 植田浩明, 山浦淳一, 後藤弘匡, 八木健彦, 佐藤博彦, 上田寛

    日本物理学会第64回年次大会  2009.3 

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  • パイロクロア酸化物Ca2Ru2O7の非線形帯磁率II

    谷口年史, 古屋貴明, 宗仲太弥, 寺田俊彦, 佐藤博彦

    日本物理学会第64回年次大会  2009.3 

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  • 遷移金属カルコゲナイドFeSeの構造評価

    高瀬浩一,東秀幸,加藤甲馬,岡崎祐真,森吉千佳子,黒岩芳弘,梅山規男,佐藤博彦,原嘉昭,宮川宣明,池田伸一,渡辺忠孝,高野良紀  2009.3 

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  • 孤立四面体構造を持つCo4B6O13における常磁性磁化の量子化

    萩原弘幸, 佐藤博彦, 岩城雅裕, 鳴海康雄, 金道浩一

    日本物理学会講演概要集,日本物理学会  2008.9 

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  • 新規Fe酸化物Fe3B7O13(OH)のメスバウアー分光

    中村真一, 角田頼彦, 野本一平, 佐藤博彦

    日本物理学会講演概要集,日本物理学会  2008.9 

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  • C1b型XMnSb(X=Ni,Pd,Pt)単結晶のNMR Ⅱ

    大岩潔, 増渕伸一, 小林義彦, 福原忠, 清水文比古, 佐藤博彦, 風間重雄

    日本物理学会講演概要集,日本物理学会  2008.9 

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  • 三角格子反強磁性体Mn(OH)2の磁化の異方性

    田中知昭, 佐藤博彦

    日本物理学会講演概要集,日本物理学会  2008.9 

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  • ゲルマニウム含有スピネル酸化物の電子線回折

    富永あやか, 松畑洋文, 梅山槻男, 原茂生, 佐藤博彦, 池田伸一

    日本物理学会講演概要集,日本物理学会  2008.9 

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  • パイロクロア酸化物Ca2Ru2O7の非線形帯磁率

    谷口年史, 宗仲太弥, 佐藤博彦

    日本物理学会講演概要集,日本物理学会  2008.9 

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  • ホーランダイト型酸化物K2Cr8O16の高圧合成と物性

    谷口年史, 宗仲太弥, 佐藤博彦

    日本物理学会講演概要集,日本物理学会  2008.9 

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  • スピネル酸化物GeNi2O4とGeCo2O4の浮遊帯域法大型単結晶成長と交流磁化率

    富永あやか, 佐藤博彦, 原茂生, 梅山規男, 池田伸一

    日本物理学会講演概要集,日本物理学会  2008.3 

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  • 新規三角格子反強磁性体Li7RuO67Li NMR

    伊藤豊, 道岡千城, 吉村一良, 中嶋香菜子, 佐藤博彦

    日本物理学会講演概要集,日本物理学会  2008.3 

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  • パイロクロア酸化物Ca2Ru2O7の比熱と電子輸送現象

    宗仲大弥, 佐藤博彦, 岡本佳比古, 広井善二

    日本物理学会講演概要集,日本物理学会  2007.9 

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  • ホランダイト型ロジウム酸化物の合成と物性

    栗原康, 佐藤博彦

    日本物理学会講演概要集,日本物理学会  2007.9 

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  • フラストレーション系Li8-δ(Ru1-xIrx)O6の構造と磁性

    中嶋香菜子, 佐藤博彦

    日本物理学会講演概要集,日本物理学会  2007.9 

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  • CoTiSb単結晶の核磁気共鳴Ⅱ

    増渕伸一, 大岩潔, 福原忠, 小林義彦, 清水文比古, 佐藤博彦, 風間重雄

    日本物理学会講演概要集,日本物理学会  2007.9 

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  • セミホイスラー化合物の単結晶育成と物性

    増渕伸一, 大岩潔, 福原忠, 清水文比古, 小林義彦, 佐藤博彦, 風間重雄

    日本物理学会講演概要集,日本物理学会  2007.9 

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  • フラストレーション構造を持つ新規Fe-B-O系化合物の特異な磁性

    野本一平, 佐藤博彦

    日本物理学会講演概要集,日本物理学会  2007.9 

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  • Co-Mn系酸化物におけるCoおよびMn K-吸収端でのX線磁気円二色性

    河村直己, 水牧仁一朗, 栗原康, 佐藤博彦

    日本物理学会講演概要集,日本物理学会  2007.3 

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  • 新規パイロクロアルテニウム酸化物Ca2Ru2O7の磁性と電気伝導

    宗仲大弥, 佐藤博彦

    日本物理学会講演概要集,日本物理学会  2007.3 

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  • Magnetism and Conductivity in Calcium Iridate: Ca2-xIrO4

    Kurihara Yasushi, Hirohiko Sato

    Kyoto Conference on Solid State Chemistry  2006.11 

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  • A novel metallic pyrochlore ruthenate: Ca2Ru2O7

    Taiya Munenaka, Hirohiko Sato

    Kyoto Conference on Solid State Chemistry  2006.11 

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  • Magnetism of layered lithium ruthenate: Li8RuO6

    Kanako Nakajima, Hirohiko Sato

    Kyoto Conference on Solid State Chemistry  2006.11 

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  • Synthesis of a novel B-Fe-O compound and its metamagnetism

    Ippei Nomoto, Hirohiko Sato

    Kyoto Conference on Solid State Chemistry  2006.11 

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  • 歪んだルチル構造を持つCrOOHの合成とフェリ磁性転移

    光岡慎平, 佐藤博彦

    日本物理学会講演概要集,日本物理学会  2006.9 

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  • Co2Mn3O8のフェリ磁性転移

    栗原康, 佐藤博彦

    日本物理学会講演概要集,日本物理学会  2006.9 

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  • Li-Ru-O系における物質探索とその特異な磁性

    中嶋香菜子, 相馬真琴, 佐藤博彦

    日本物理学会講演概要集,日本物理学会  2006.9 

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  • 軌道Ferri磁性体CoMnO3の電子状態の温度変化

    水牧仁一朗, 河村直己, 魚住孝幸, 佐藤博彦, 中村哲也, 伊藤真義, 櫻井吉晴

    日本物理学会講演概要集,日本物理学会  2006.9 

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  • KSbO3型 レニウム酸化物の磁性と導電性

    鈴木裕丈, 佐藤博彦

    日本物理学会講演概要集,日本物理学会  2005.9 

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  • リチウムを含むルテニウム酸化物Li3RuO4の磁性

    相馬真琴, 佐藤博彦

    日本物理学会講演概要集,日本物理学会  2005.9 

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  • RhOOHの水素脱離反応と電子状態の変化

    水野宏樹, 佐藤博彦

    日本物理学会講演概要集,日本物理学会  2005.9 

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  • 遷移金属水酸化酸化物におけるトポタクティックな水素脱離反応とそれを利用した物性制御の試み

    水野宏樹, 佐藤博彦, 谷口やよい

    分子構造総合討論会講演要旨集,分子構造総合討論会事務局  2005.9 

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  • トンネル構造を持つ新規モリブデン酸化物Rb1.5Mo8O16の磁性と電子輸送現象

    佐藤博彦, 小澤隆仁, 鈴木勲

    日本物理学会講演概要集,日本物理学会  2005.9 

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  • CoおよびMnK-吸収端XMCDによる軌道フェリ磁性体CoMnO3の4p電子状態の研究

    川村直己, 水牧仁一郎, 宮川勇人, 渡辺峰旨, 佐藤博彦

    日本物理学会講演概要集,日本物理学会  2005.3 

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  • 軟X線による軌道Ferri磁性体CoMnO3の電子状態の研究

    水牧仁一朗, 佐藤博彦, 渡辺峰旨, 河村直己, 中村哲也, 宮川隼人, 安居院あかね

    日本物理学会講演概要集,日本物理学会  2004.9 

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  • トンネル型モリブデン酸化物の磁性と電子輸送現象

    小澤隆仁, 佐藤博彦

    日本物理学会講演概要集,日本物理学会  2004.9 

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  • 新規三次元直交ダイマー系Ba1.6Sr0.4Ru3O9の磁性と導電性

    渡辺 峰旨, 佐藤 博彦

    日本物理学会講演概要集,日本物理学会  2004.3 

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  • 新規5d強相関酸化物Ba2Ir3O9の結晶構造と物性

    川村陽一, 佐藤博彦

    日本物理学会講演概要集,日本物理学会  2003.9 

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  • 新規4d強相関酸化物Ba2Ru7O18の構造と物性

    小川俊之, 佐藤博彦

    日本物理学会講演概要集,日本物理学会  2003.9 

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  • 吸着によって誘起される活性炭素繊維の特異的な磁性

    河津 直樹, 佐藤 博彦, 榎 敏明, 遠藤 守信

    日本物理学会第56回年次大会、八王子  2001.3 

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  • らせん磁性体β-MnO2の臨界現象

    佐藤 博彦, 脇谷 享士, 藤井 悟, 榎 敏明, 木山 隆, 若林 裕助, 中尾 裕則, 村上 洋一

    日本物理学会秋の分科会(新潟)  2000.9 

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  • Structure,Magnetism and Optical Property of Novel Manganese Oxide:BaMn3O6

    Koji Wakiya, Hirohiko Sato, Toshiaki Enoki, Masahiko Isobe, Yutaka Ueda

    第13回遷移元素固体化合物国際会議、ストレーザ(イタリア)  2000.4 

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  • 129I Mössbauer Effect of Iodine Adsorbed in Activated Carbon Fibers

    Yoshiyuki Shibayama ,othe

    Mol. Crsyt. Liq. Cryst/Gordon and Breach  2000.3 

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  • Anomalous Angular Dependence of Magnetoresistance in MCl2-GIC's (M = Cu and Co)

    H. Sato, T. Enoki, I.S. Suzuki, M. Suzuki

    Mol. Crsyt. Liq. Cryst/Gordon and Breach  2000.3 

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  • Fluorine-introduced sp3-carbon sites in a nano-sized p-electron system and their effects on the electronic properties

    Kazuyuki Takai

    Mol. Crsyt. Liq. Cryst./Gordon and Breach  2000.3 

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  • Nano-Graphites and their Potassium Intercalated Compounds: Structural and Electronic Properties

    B.L.V. Prasad, H. Sato, T. Enoki, Y. Hishiyama, Y. Kaburagi

    Mol. Crsyt. Liq. Cryst/Gordon and Breach  2000.3 

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  • Successive Magnetic Phase Transitions of CucCo1-cCl2-FeCl3 Graphite Bi-intercalation Compounds

    I.S. Suzuki, M. Suzuki, H. Sato, T. Enoki

    Mol. Crsyt. Liq. Cryst/Gordon and Breach  2000.3 

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  • X線磁気散乱によるβ-MnO2の磁気構造の観察

    佐藤博彦ほ

    日本物理学会講演概要集,日本物理学会  2000.3 

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  • Host-Guest Systems in Microporous Carbons

    Toshiaki Enoki

    Mat. Res. Soc. Symp. Proc/Materials Research Society  1999.11 

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  • Structural and Electronic Properties of Low Heat-treated Nono-Diamond Particles

    B.L.V.Prasad, Hirohiko Sato, Toshiaki Enoki, Yoshihiro Hishiyama, Yutaka Kaburagi

    分子構造総合寸論会講演要旨集,日本化学会  1999.9 

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  • 新規マンガン酸化物BaMn3O6の構造と磁性

    脇谷享士, 佐藤博彦, 宮崎章, 榎敏明

    分子構造総合寸論会講演要旨集,日本化学会  1999.9 

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  • ルチル型二酸化マンガンにおける磁性と電子輸送現象の相関

    佐藤博彦, 榎敏明

    日本物理学会講演概要集,日本物理学会  1999.9 

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  • Oxygen Effects on Microporous Activated Carbon Fibers

    H. Sato, Y. Yoshikawa, T. Enoki, M. Endo

    Extended Abstract of Int. Symp. On Carbon, Nov. 9-12 (1998), Tokyo, Japan/The Carbon Society of Japan  1998.11 

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  • Structure and Properties of Fluorinated Activated Carbon Fibers

    Naohiko Yoshida, o

    Extended Abstract of Int. Symp. On Carbon, Nov. 9-12 (1998), Tokyo, Japan/The Carbon Society of Japan  1998.11 

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  • トンネル型混合原子価マンガン酸化物の電荷整列転移と逐次磁気相転移

    佐藤博彦, 榎敏明, 山浦淳一, 山本直一

    分子構造総合寸論会講演要旨集,日本化学会  1998.9 

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  • C6Euの磁気抵抗と熱起電力

    内田剛志, 佐藤博彦, 榎敏明

    日本物理学会講演概要集,日本物理学会  1998.9 

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  • ナノグラファイト集合体である活性炭素繊維の磁気抵抗とその電子状態

    柴山義行, 佐藤博彦, 榎敏明, 遠藤守信, 進戸規文

    日本物理学会講演概要集,日本物理学会  1998.9 

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  • トンネル構造を持つマンガン酸化物の磁性と電気伝導

    脇谷享士, 佐藤博彦, 榎敏明

    日本物理学会講演概要集,日本物理学会  1998.9 

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  • Magnetic Properties of Activated Carbon Fibers and Their Iodine-Doping Effect, Yoshiyuki Shibayama

    Y. Shibayama, H. Sato, T. Enoki, M. Endo, N. Shindo

    Mol. Cryst. Liq. Cryst/Gordon and Breach  1998.2 

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  • The C-Axis Magnetoresistance and Thermoelectric Power of CuCl2 Graphite Intercalation Compounds

    O.E. Andersson, H. Sato, T. Enoki, M. Suzuki, I.S. Suzuki

    Mol. Crsyt. Liq. Cryst/Gordon and Breach  1998.2 

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  • 活性炭素繊維の酸素による伝導物性の変化

    吉川雄飛, 佐藤博彦, 榎敏明, 遠藤守信

    分子構造総合寸論会講演要旨集,日本化学会  1997.10 

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  • 活性炭素繊維におけるマイクログラファイトの電子状態

    柴山義行, 佐藤博彦, 榎敏明, 遠藤守信, 進戸規文

    日本物理学会講演概要集,日本物理学会  1997.10 

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  • The thermoelectric power of CuCl2 graphite intercalation compound

    O.E.Andersson, 榎敏明, 佐藤博彦, 鈴木正継, 鈴木伊津子

    日本物理学会講演概要集,日本物理学会  1997.10 

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  • 活性炭素繊維のフッ素化によるナノサイズ●電子共役系の制御とその物性

    高井和之ほ

    分子構造総合寸論会講演要旨集,日本化学会  1997.10 

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  • 一次元トンネル構造を持つマンガン酸化物K1.5Mn8O16の磁性と電子輸送現象

    佐藤博彦, 山浦淳一, 榎敏明, 山本直一

    日本物理学会講演概要集,日本物理学会  1996.10 

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  • カリウムグラファイト層間化合物のコンプトンプロファイル

    朝久野崇ほ

    日本物理学会講演概要集,日本物理学会  1995.9 

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  • HOPGのコンプトンプロファイル

    桜井吉晴ほ

    日本物理学会講演概要集,日本物理学会  1995.9 

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  • Complex Susceptibility and Penetration Depth of BEDT-TTF Based Layered Superconductors

    Y. Nakazawa, H. Sato, A. Kawamoto, K. Kato, K. Kanoda

    Synth. Metals/Elsevier Science  1995.3 

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  • Electronic State of κ-(BMDT-TTF)2Au(CN)2 Studied by NMR and Thermoelectric Measurements

    K. Miyagawa, H. Sato, A. Kawamoto, K. Kanoda, T. Mori

    Synth. Metals/Elsevier Science  1995.3 

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  • Resistive Transition in an Extremely Two-Dimensional Superconductor, α-(BEDT-TTF)2NH4Hg(SCN)4

    Hirohiko Sato

    Synth. Metals/Elsevier Science  1995.3 

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  • Specific Heat Study of α-(BEDT-TTF)2MHg(SCN)4

    Y. Nakazawa, H. Sato, A. Kawamoto, K. Kanoda

    Synth. Metals/Elsevier Science  1995.3 

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  • Structural and Physical Properties of θ-(BEDT-TTF)2Cu2(CN)[N(CN)2]2

    T. Komatsu

    Synth. Metals/Elsevier Science  1995.3 

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  • Study on Carriers and Charge-Density Wave Transitions of Two-Dimensional Metals (K1-xRbx)3Cu8S6, (Rb1-xCsx)3Cu8S6, K3Cu8(S<

    H. Sato, N. Kojima

    Synth. Metals/Elsevier Science  1993.4 

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  • Phase Diagram of the Three-Dimensional Halogen-Bridged Mixed-Valence Compounds M2Au2X6 (M=Rb, Cs; X=Cl, Br, I) under High Pressure

    Norimichi Kojima

    Jpn. J. Appl. Phys. 32, Suppl/The Physical Society of Japan  1993.1 

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  • Successive Phase Transitions in the Three-Dimensional Halogen Bridged Mixed-Valence Compound Rb2Au2I6 under High Pressures

    A. Tanaka, H. Sato, N. Kojima, T. Kikegawa, O. Shimomura

    Proc. XIII AIRAPT Int. Conf. High Pressure Science and Technology, Oct. 7-11 (1991), Bangalore, India  1991.10 

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  • Structure Analysis of High-Pressure Metallic State of the Three-Dimensional Mixed-Valence Compound Cs2AuIAuIIII6 by X-Ray Diffraction using SR

    H. Kitagawa, H. Sato, N. Kojima, T. Kikegawa, O. Shimomura

    Synth. Metals/Elsevier Science  1991.5 

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Research Projects

  • 強電子相関ゼオライトの開発と吸着現象を利用した新しい磁性相、超伝導相の探索

    2003.4 - 2005.3

    文部科学省  文部科学省科学研究費(若手研究B) 

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    Grant type:Competitive

    Grant amount: \3700000

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  • 溶融塩電解法による新しいホスト―ゲスト型強相関遷移金属酸化物の物質開発

    2002.4 - 2003.3

    文部科学省  文部科学省科学研究費(特定領域研究2) 

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    Grant type:Competitive

    Grant amount: \1900000

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  • 超高真空極低温高磁場光電子走査型トンネル顕微鏡の制作

    1998.4 - 2001.3

    文部科学省  文部科学省科学研究費 

    榎 敏明

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    Grant type:Competitive

    Grant amount: \30400000

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Intellectual property rights

  • 単結晶製造方法および大型単結晶

    池田 伸一,梅山 規男,堀口 悟史,八木 翔太

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    Application no:特願2011ー079087  Date applied:2011.3.31

    Announcement no:特開2012-214304  Date announced:2012.11.8

    Applicant (Organization):学校法人中央大学、独立行政法人産業技術総合研究所

Allotted class

  • 2024   Graduation Thesis Ⅰ   Department

  • 2024   Graduation Thesis Ⅱ   Department

  • 2024   Condensed Matter Physics   Department

  • 2024   Experimental Physics 2   Department

  • 2024   Physics 1   Department

  • 2024   Electromagnetism 2   Department

  • 2024   Solid State Chemistry Ⅰ   Graduate school

  • 2024   Doctoral Research Ⅰ   Graduate school

  • 2024   Doctoral Research Ⅱ   Graduate school

  • 2024   Doctoral Research Ⅲ   Graduate school

  • 2024   Doctoral Research Ⅳ   Graduate school

  • 2024   Doctoral Research Ⅴ   Graduate school

  • 2024   Doctoral Research Ⅵ   Graduate school

  • 2024   Special lecture on physics   Graduate school

  • 2024   Master's Research Ⅰ   Graduate school

  • 2024   Master's Research Ⅲ   Graduate school

  • 2024   Master's Research Ⅱ   Graduate school

  • 2024   Master's Research Ⅳ   Graduate school

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