1991 Fiscal Year Annual Research Report

新しい物質設計指針に基づく高温超伝導体の開発

Research Project

Project/Area Number	03101003
Research Institution	Aoyama Gakuin University
Principal Investigator	秋光純青山学院大学, 理工学部, 教授 (80013522)
Co-Investigator(Kenkyū-buntansha)	藤森淳東京大学, 理学部, 助教授 (10209108) 十倉好紀東京大学, 理学部, 助教授 (30143382)
Keywords	超伝導体の物質設計 / ブロック層 / 価数制御 / 金属ー絶縁体転移 / 電子有効質量の異常増大 / トンネル効果 / 光電子分光 / 負の電荷移動エネルギ-
Research Abstract	平成3年度は、 (1)、銅酸化物超伝導体の電子状態の構造敏感性とそれを考慮した物質設計を行った。特に申請者らの提唱したブロック層の概念を用いて物質設計を行い、叉、新しいブロック層の開発に努めた。更に、高圧下に於ける電子状態の変化など構造に敏感に依存した電子論的なパラメ-タを明らかにし、高温超伝導体になるための条件を定量化した。 (2)非銅系の高温超伝導体の探索の目的をかねて、価数制御(キャリア-ド-ピング)したチタン、バナジュウム、ニオブ酸化物の物質合成の詳細について集中的な研究を進めた。特に、フィリングネスを系統的に変えたペロブスカイト酸化物、二次元酸化物を合成し、電気的、磁気的物性を調べて電子相図を作製しつつある。特に、分光的手法により強相関電子系に特徴的な電子構造の変化(ギャップ内状態、キャリア-ドピングによる金属ー絶縁体転移、電子有効質量の異常増大など)を解明しつつある。 (3)シェブレル構造をもつボロン化合物についても、系統的にキャリア-を変化させ、新しい超伝導体の可能性を模索している。 (4)光電子スペクトルの解析から、異常に高い原子価をもつ一部の遷移金属酸化物(NaCuO_2,SrFeO_3等)の電荷移動エネルギ-が従来考えられていたように正の値をとるのではなく、負の値をとるという新しいタイプの電子構造をもつことを見いだした。更に、このような物質の金属ー絶縁体転移が結晶構造と密接に関連していることを提唱した。このように多くの光電子スペクトルの解析から、電子構造を特徴づけるパラメ-タを系統的に評価し、新しい物質の電子構造物性を予測する経験測を見いだしつつある。

Research Products
(56 results)

All Other

All Publications (56 results)

[Publications] 国分道雄他: "新しい銅酸化物超伝導体の設計" 粉体および粉末冶金. 38. 195-198 (1991)
[Publications] 秋光純: "新超伝導物質の設計" 応用物理学会誌. 60. 466-469 (1991)
[Publications] J.Akimitsu et al.: "A New Non-Cu Oxide Superconductor (Sr_<1-x>Ln_x)Nb_2O_<6-y> (Ln:La,Nd,Pr,Ce,Gd and Ho)" Jpn.J.Appl.Phys.30. 1155-1156 (1991)
[Publications] J.Akimitsu et al.: "Superconductivity in Sr(Ln)-Nb-O System" Physica C. 185-189. 723-724 (1991)
[Publications] H.Nakane et al.: "Measurement of Very Low Resistivity for a Rod-shaped Superconductor" Physica C. 185-189. 1329-1330 (1991)
[Publications] J.Akimitsu et al.: "Design of High-T_c Oxide Superconductors" Proc.of 2nd ISSP Int.Symp.(1991)
[Publications] J.Kikuchi et al.: " ^<51>V Knight Shift and Quadrupole Interaction in the Low-Temperature Phase of LiVO_2" Journal of Physical Society of Japan. 60. 3620-3624 (1991)
[Publications] S.Funahashi et al.: "Neutron Diffraction of Two-Dimensional Triangular Lattice of ErFe_2O_4" Physica B. 174. 74-76 (1991)
[Publications] K.Tajima et al.: "The Time Evolution of the First-Order Magnetic Phase-Transition in Dy-4%Y Alloy" Journal of Magnetism and Magnetic Materials. 104 107. 177-178 (1992)
[Publications] Y.Kimishima et al.: "Phase Transition in LiVO_2" Journal of Magnetism and Magnetic Materials. 104 107. 779-780 (1992)
[Publications] T.Ekino et al.(Y.Muto ed.): "Tunneling Spectroscopy of Copper-Oxide Superconductors" Mechanism of Superconductivity. 260-271 (1992)
[Publications] J.Akimitsu(Y.Muto ed.): "New Material Design of Cu-Oxide Superconductors" Mechanism of Superconductivity. 20-22 (1992)
[Publications] H.Kito et al.: "Stabilization of the Orthorhombic Form in (La_<1-x>Ca_x)_2CuO_4 (x=0.05)" Physica C.
[Publications] T.Ekino et al.: "Tunneling Study of Superconducting Energy Gaps in Bi_2Sr_2CuO_<6+y> Based Compounds with Several Tc" Physical Review B.
[Publications] S.Uchida et al.: "Optical Spectra of La_<2-x>Sr_xCuO_4:Effect of Carrier Doping on the Electronic Structure of CuO_2 Plane" Physical Review B. 43. 7942-7954 (1991)
[Publications] T.Arima et al.: "Optical Excitations in CuO_2 Sheets and Their Strong Dependence on Cu-O Coordinations and Bond Length" Physical Review B. 44. 917-920 (1991)
[Publications] Y.Tokura: "Material Overview of High-T_c Oxides" Physica C. 185-189. 174-179 (1991)
[Publications] Y.Fujishima et al.: "Optical Spectra of Titanium Oxide Perovskite with Varying Number of d-Electrons" Physica C. 185-189. 1001-1002 (1991)
[Publications] T.Arima et al.: "Optical Conductivity in Pr_<2ーx>Ce_xCuO_<4ーδ> Single Crystals:Comparison with the Case of La_<2ーx>Sr_xCuO_4" Physica C. 185ー189. 1021-1022 (1991)
[Publications] Y.Nakamura et al.: "In-Plane and Out-of Plane Thermal Conductivity of La_<2-x> Sr_xCuO_4 Single Crystals" Physica C. 185-189. 1409-1410 (1991)
[Publications] T.Arima et al.: "CuーO Bond Length Dependence of Optical Properties in T｀ーPhase Single Crystals" Proc.of 2nd ISSP Int.Symp.
[Publications] Y.Moritomo et al.: "High-Pressure Spectroscopy of Cu-O Vibrational Modes in High-T_c Superconductors and Related Layered Compounds" Proc.of 2nd ISSP Int.Symp.
[Publications] Y.Tokura et al.: "Pressure Dependence of Charge-Transfer Type Gaps in CuO_2-Layered Compounds" to appear in Physical Review B.
[Publications] Y.Fujishima et al.: "Optical Conductivity Spectra of Sr_<1-x>La_xTiO_3:Filling-Dependent Effect of Electron Correlation" submitted to Physical Review B.
[Publications] A.Fujimori et al.: "Electron Correlation,d-Band Formation and Magnetism in V_5S_8:Photoemission Spectroscopic Study" Physical Review B. 44. 163-169 (1991)
[Publications] T.Koide et al.: "Magnetic Circular Dichroism at the M_<2,3> Absorption Edges in Ferromagnetic Ni and Ferrimagnetic Fe_2O_3" Physical Review B. 44. 4697-4700 (1991)
[Publications] M.Abbate et al.: "Soft-X-Ray Absorption Study of the Location of Extra Charges Induced by Substitution in Controlled-Valence Materials" Physical Review B. 44. 5419-5423 (1991)
[Publications] P.Kuiper et al.: "The Unoccupied Density of State of La_<2-x>Sr_xNiO_4 Studied by Polarization Dependent O Is X-ray Absorption Spectroscopy" Physical Review B. 44. 4570-4575 (1991)
[Publications] T.Mizokawa et al.: "Origin of the Band Gap in the Negative-Charge-Transfer-Energy Compound NaCuO_2" Physical Review Letters. 67. 1683-1686 (1991)
[Publications] A.Fujimori et al.: "Doping Dependence of the Electronic Structure of Superconducting and Non-Superconducting Oxides:High-Energy Spectroscopic Studies" Physica C. 185-189. 51-56 (1991)
[Publications] A.E.Bocquet et al.: "Electronic Structure of SrFe^<4+>O_3 and Related Perovskite Fe Oxides" Physical Review B. 45. 1561- (1991)
[Publications] M.Matoba et al.: "Thermal Expansion,Thermoelectric Power,and XPS Study of the Nonmetal-Metal Transition in Ni_<1-x>S_<1-y>Se_y" Journal of the physical Society of Japan. 60. 4230-4244 (1991)
[Publications] T.Mizokawa et al.: "Photoemission Study of Metallic but Not Superconducting and Insulating Copper Oxides" Physica C. 185-189. 1053-1054 (1991)
[Publications] H.Namatame et al.: "Electronic Structure of BaPb_<1-x>Bi_xO_3 Studied by Photoemission Spectroscopy" Physica C. 185-189. 2725-2726 (1991)
[Publications] I.H.Inoue et al.: "Electronic Structure of the Organic Conductor (dimethyl-DCNQI)_2Cu_2 Studied by Photoemission Spectroscopy" Physica C. 185-189. 2691-2692 (1991)
[Publications] I.H.Inoue et al.: "Copper Valence Fluctuation in the Organic Conductor (dimethyl-N,N-dicyanoquinonediimine)_2Cu Studied by X-Ray Photoemission Spectroscopy" Physical Review B.
[Publications] T.Mamori et al.: "Effect of Co Substitution on the Electronic Structure of NiS Studied by Photoemission Spectroscopy" Journal of the Physical Society of Japan.
[Publications] H.Eisaki et al.: "Photoemission and Inverse Photoemission Study of La_<2-x>Sr_xNiO_4" Physical Review B.
[Publications] A.E.Bocquet et al.: "Electronic Structure of 3d Transition-Metal Compounds by Analysis of Metal-2p Core Level Photoemission Spectra" Physical Review B.
[Publications] M.Nakamura et al.: "Valence Fluctuation in αーCuVO_3 Studied by photoemission Spectroscopy" Physical Review B.
[Publications] M.Abbate et al.: "Controlled Valence Properties of La_<1-x>Sr_xFeO_3 and La_<1-x>Sr_xMnO_3 Studied by X-Ray Absorption Spectroscopy" Physical Review B.
[Publications] A.Fujimori et al.: "Evolution of the Spectral Function in Mott-Hubbard Systems with d^1 Configuration" Physical Review Letters.
[Publications] A.Fujimori et al.: "Doping-Induced States in La_<1-x>Sr_xTiO_3:Applicability of the One-Electron Rigid-Band Model and the Hubbard Model" Physical Review B.
[Publications] T.Mizokawa et al.: "Origin of the Band Gaps in Negative-Charge-Transfer-Energy Compounds" International Journal of Modern Physics.
[Publications] H.Namatame et al.: "Electronic Structure and Metal-Insulator Transition in BaPb_<1-x>Bi_xO_3" Physical Review B.
[Publications] T.Ekino et al.: "Tunneling Spectroscopy on High-Tc Superconductors Studies of High Temperature Superconductors vol.8" (A.Narlikar ed.) Nova Science Pub.,
[Publications] Y.Tokura: "Chemistry of High-Temperature Superconductors" C.N.R.Rao(ed.) World Scientific,
[Publications] J.Akimitsu: "High-Tc Superconductors Based on the New Material Design" Gordon & Breach Science Pub.,
[Publications] 秋光純(分担執筆): "超伝導低温工学ハンドブック" オ-ム社,
[Publications] Y.Tokura: "Physics of High Temperature Superconductors Material Design of High-T_c Oxides" (ed.S.Maekawa et al.),
[Publications] A.Fujimori: "Diluted Magnetic Semiconductors" M.Jain(ed.) World Scientific, 652
[Publications] A.Fujimori: "Physics of High Temperature Superconductors" S.Maekawa et al.(ed.) Springer-Verlag,
[Publications] A.Fujimori: "Mechanisms of Superconductivity" Y.Muto他 (ed.) The Physical Society of Japan,
[Publications] A.Fujimori: "Recent Advances in Magnetism of Transition Metal Compounds" A.Kotani et al.(ed.) World Scientific,
[Publications] 藤森淳他: "シリ-ズ:新しい物性物理を考える(第8巻)" 丸善,
[Publications] 津田惟雄他: "電気伝導性酸化物(改訂版)" 裳華房,

1991 Fiscal Year Annual Research Report

新しい物質設計指針に基づく高温超伝導体の開発

Principal Investigator

秋光 純 青山学院大学, 理工学部, 教授 (80013522)

Research Products

[Publications] 国分 道雄他: "新しい銅酸化物超伝導体の設計" 粉体および粉末冶金. 38. 195-198 (1991)

[Publications] 秋光 純: "新超伝導物質の設計" 応用物理学会誌. 60. 466-469 (1991)

[Publications] J.Akimitsu et al.: "A New Non-Cu Oxide Superconductor (Sr_<1-x>Ln_x)Nb_2O_<6-y> (Ln:La,Nd,Pr,Ce,Gd and Ho)" Jpn.J.Appl.Phys.30. 1155-1156 (1991)

[Publications] J.Akimitsu et al.: "Superconductivity in Sr(Ln)-Nb-O System" Physica C. 185-189. 723-724 (1991)

[Publications] H.Nakane et al.: "Measurement of Very Low Resistivity for a Rod-shaped Superconductor" Physica C. 185-189. 1329-1330 (1991)

[Publications] J.Akimitsu et al.: "Design of High-T_c Oxide Superconductors" Proc.of 2nd ISSP Int.Symp.(1991)

[Publications] J.Kikuchi et al.: " ^<51>V Knight Shift and Quadrupole Interaction in the Low-Temperature Phase of LiVO_2" Journal of Physical Society of Japan. 60. 3620-3624 (1991)

[Publications] S.Funahashi et al.: "Neutron Diffraction of Two-Dimensional Triangular Lattice of ErFe_2O_4" Physica B. 174. 74-76 (1991)

[Publications] K.Tajima et al.: "The Time Evolution of the First-Order Magnetic Phase-Transition in Dy-4%Y Alloy" Journal of Magnetism and Magnetic Materials. 104 107. 177-178 (1992)

[Publications] Y.Kimishima et al.: "Phase Transition in LiVO_2" Journal of Magnetism and Magnetic Materials. 104 107. 779-780 (1992)

[Publications] T.Ekino et al.(Y.Muto ed.): "Tunneling Spectroscopy of Copper-Oxide Superconductors" Mechanism of Superconductivity. 260-271 (1992)

[Publications] J.Akimitsu(Y.Muto ed.): "New Material Design of Cu-Oxide Superconductors" Mechanism of Superconductivity. 20-22 (1992)

[Publications] H.Kito et al.: "Stabilization of the Orthorhombic Form in (La_<1-x>Ca_x)_2CuO_4 (x=0.05)" Physica C.

[Publications] T.Ekino et al.: "Tunneling Study of Superconducting Energy Gaps in Bi_2Sr_2CuO_<6+y> Based Compounds with Several Tc" Physical Review B.

[Publications] S.Uchida et al.: "Optical Spectra of La_<2-x>Sr_xCuO_4:Effect of Carrier Doping on the Electronic Structure of CuO_2 Plane" Physical Review B. 43. 7942-7954 (1991)

[Publications] T.Arima et al.: "Optical Excitations in CuO_2 Sheets and Their Strong Dependence on Cu-O Coordinations and Bond Length" Physical Review B. 44. 917-920 (1991)

[Publications] Y.Tokura: "Material Overview of High-T_c Oxides" Physica C. 185-189. 174-179 (1991)

[Publications] Y.Fujishima et al.: "Optical Spectra of Titanium Oxide Perovskite with Varying Number of d-Electrons" Physica C. 185-189. 1001-1002 (1991)

[Publications] T.Arima et al.: "Optical Conductivity in Pr_<2ーx>Ce_xCuO_<4ーδ> Single Crystals:Comparison with the Case of La_<2ーx>Sr_xCuO_4" Physica C. 185ー189. 1021-1022 (1991)

[Publications] Y.Nakamura et al.: "In-Plane and Out-of Plane Thermal Conductivity of La_<2-x> Sr_xCuO_4 Single Crystals" Physica C. 185-189. 1409-1410 (1991)

[Publications] T.Arima et al.: "CuーO Bond Length Dependence of Optical Properties in T｀ーPhase Single Crystals" Proc.of 2nd ISSP Int.Symp.

[Publications] Y.Moritomo et al.: "High-Pressure Spectroscopy of Cu-O Vibrational Modes in High-T_c Superconductors and Related Layered Compounds" Proc.of 2nd ISSP Int.Symp.

[Publications] Y.Tokura et al.: "Pressure Dependence of Charge-Transfer Type Gaps in CuO_2-Layered Compounds" to appear in Physical Review B.

[Publications] Y.Fujishima et al.: "Optical Conductivity Spectra of Sr_<1-x>La_xTiO_3:Filling-Dependent Effect of Electron Correlation" submitted to Physical Review B.

[Publications] A.Fujimori et al.: "Electron Correlation,d-Band Formation and Magnetism in V_5S_8:Photoemission Spectroscopic Study" Physical Review B. 44. 163-169 (1991)

[Publications] T.Koide et al.: "Magnetic Circular Dichroism at the M_<2,3> Absorption Edges in Ferromagnetic Ni and Ferrimagnetic Fe_2O_3" Physical Review B. 44. 4697-4700 (1991)

[Publications] M.Abbate et al.: "Soft-X-Ray Absorption Study of the Location of Extra Charges Induced by Substitution in Controlled-Valence Materials" Physical Review B. 44. 5419-5423 (1991)

[Publications] P.Kuiper et al.: "The Unoccupied Density of State of La_<2-x>Sr_xNiO_4 Studied by Polarization Dependent O Is X-ray Absorption Spectroscopy" Physical Review B. 44. 4570-4575 (1991)

[Publications] T.Mizokawa et al.: "Origin of the Band Gap in the Negative-Charge-Transfer-Energy Compound NaCuO_2" Physical Review Letters. 67. 1683-1686 (1991)

[Publications] A.Fujimori et al.: "Doping Dependence of the Electronic Structure of Superconducting and Non-Superconducting Oxides:High-Energy Spectroscopic Studies" Physica C. 185-189. 51-56 (1991)

[Publications] A.E.Bocquet et al.: "Electronic Structure of SrFe^<4+>O_3 and Related Perovskite Fe Oxides" Physical Review B. 45. 1561- (1991)

[Publications] M.Matoba et al.: "Thermal Expansion,Thermoelectric Power,and XPS Study of the Nonmetal-Metal Transition in Ni_<1-x>S_<1-y>Se_y" Journal of the physical Society of Japan. 60. 4230-4244 (1991)

[Publications] T.Mizokawa et al.: "Photoemission Study of Metallic but Not Superconducting and Insulating Copper Oxides" Physica C. 185-189. 1053-1054 (1991)

[Publications] H.Namatame et al.: "Electronic Structure of BaPb_<1-x>Bi_xO_3 Studied by Photoemission Spectroscopy" Physica C. 185-189. 2725-2726 (1991)

[Publications] I.H.Inoue et al.: "Electronic Structure of the Organic Conductor (dimethyl-DCNQI)_2Cu_2 Studied by Photoemission Spectroscopy" Physica C. 185-189. 2691-2692 (1991)

[Publications] I.H.Inoue et al.: "Copper Valence Fluctuation in the Organic Conductor (dimethyl-N,N-dicyanoquinonediimine)_2Cu Studied by X-Ray Photoemission Spectroscopy" Physical Review B.

[Publications] T.Mamori et al.: "Effect of Co Substitution on the Electronic Structure of NiS Studied by Photoemission Spectroscopy" Journal of the Physical Society of Japan.

[Publications] H.Eisaki et al.: "Photoemission and Inverse Photoemission Study of La_<2-x>Sr_xNiO_4" Physical Review B.

[Publications] A.E.Bocquet et al.: "Electronic Structure of 3d Transition-Metal Compounds by Analysis of Metal-2p Core Level Photoemission Spectra" Physical Review B.

[Publications] M.Nakamura et al.: "Valence Fluctuation in αーCuVO_3 Studied by photoemission Spectroscopy" Physical Review B.

[Publications] M.Abbate et al.: "Controlled Valence Properties of La_<1-x>Sr_xFeO_3 and La_<1-x>Sr_xMnO_3 Studied by X-Ray Absorption Spectroscopy" Physical Review B.

[Publications] A.Fujimori et al.: "Evolution of the Spectral Function in Mott-Hubbard Systems with d^1 Configuration" Physical Review Letters.

[Publications] A.Fujimori et al.: "Doping-Induced States in La_<1-x>Sr_xTiO_3:Applicability of the One-Electron Rigid-Band Model and the Hubbard Model" Physical Review B.

[Publications] T.Mizokawa et al.: "Origin of the Band Gaps in Negative-Charge-Transfer-Energy Compounds" International Journal of Modern Physics.

[Publications] H.Namatame et al.: "Electronic Structure and Metal-Insulator Transition in BaPb_<1-x>Bi_xO_3" Physical Review B.

[Publications] T.Ekino et al.: "Tunneling Spectroscopy on High-Tc Superconductors Studies of High Temperature Superconductors vol.8" (A.Narlikar ed.) Nova Science Pub.,

[Publications] Y.Tokura: "Chemistry of High-Temperature Superconductors" C.N.R.Rao(ed.) World Scientific,

[Publications] J.Akimitsu: "High-Tc Superconductors Based on the New Material Design" Gordon & Breach Science Pub.,

[Publications] 秋光純(分担執筆): "超伝導低温工学ハンドブック" オ-ム社,

[Publications] Y.Tokura: "Physics of High Temperature Superconductors Material Design of High-T_c Oxides" (ed.S.Maekawa et al.),

[Publications] A.Fujimori: "Diluted Magnetic Semiconductors" M.Jain(ed.) World Scientific, 652

[Publications] A.Fujimori: "Physics of High Temperature Superconductors" S.Maekawa et al.(ed.) Springer-Verlag,

[Publications] A.Fujimori: "Mechanisms of Superconductivity" Y.Muto他 (ed.) The Physical Society of Japan,

[Publications] A.Fujimori: "Recent Advances in Magnetism of Transition Metal Compounds" A.Kotani et al.(ed.) World Scientific,

[Publications] 藤森 淳他: "シリ-ズ:新しい物性物理を考える(第8巻)" 丸善,

[Publications] 津田 惟雄他: "電気伝導性酸化物(改訂版)" 裳華房,

秋光純青山学院大学, 理工学部, 教授 (80013522)

[Publications] 国分道雄他: "新しい銅酸化物超伝導体の設計" 粉体および粉末冶金. 38. 195-198 (1991)

[Publications] 秋光純: "新超伝導物質の設計" 応用物理学会誌. 60. 466-469 (1991)

[Publications] 藤森淳他: "シリ-ズ:新しい物性物理を考える(第8巻)" 丸善,

[Publications] 津田惟雄他: "電気伝導性酸化物(改訂版)" 裳華房,