1992 年度実績報告書

有機導体における強い相関をもつ低次元電子系の研究

研究課題

研究課題/領域番号	03302017
研究機関	東京大学
研究代表者	鹿児島誠一東京大学, 教養学部教授 (30114432)
研究分担者	大嶋孝吉岡山大学, 理学部, 教授 (10114414) 高田慧筑波大学, 物理学系, 教授 (10015779) 石黒武彦京都大学, 理学部, 教授 (50202982) 梶田晃示東邦大学, 理学部, 教授 (50011739) 豊田直樹東北大学, 金属材料研究所, 助教授 (50124607)
キーワード	有機導体 / 電子相関 / 低次元電子 / 電気伝導 / 電荷密度 / スピン密度 / 磁気抵抗 / 価数揺動
研究概要	この研究の目的は,低次元電子系をもつ有機導体において,電子間クーロン相関が低次元電子の振る舞いに与える影響を明らかにするこである。今年度は,TMTSF系物質,BEDT-TTF系物質,およびDCNQI-Cu系物質について以下のような著しい成果を得た。まずTMTSF系物質では,低次元性と電子間相関とによって起こる磁場誘起スピン密度波状態とこれに関連する電子物性の理解を進めた。数種の物質の比較によって,CIO4塩の高磁場極限相が量子数ゼロのスピン密度波状態であると理釈でき,負イオンの作るポテンシャルがこの相の現れかたや磁気抵抗の早い振動と関係しているこを示した。 BEDT-TTF系物質でも,低温でフェルミ面の不安定性に関係したどのような磁気的状態があるかを調ベた。K塩,NH4塩の他に,Rb塩についても現象を明らかにし,Rb塩はK塩と本質的には同様であることを示した。K塩の「反強磁性」と孝えられる状態の磁気異方性,フェルミ面形状の圧力変化,K塩の「反強磁性」状態の圧力変化などを調べた。K塩の「反強磁性」状態は,8K以下の低温,23T以下の弱磁場,5Kbar以下の低圧領域で存在することを明らかにした。 DCNQI塩では,DCNQI-Cu塩の絶縁体状態での反強磁性構造を,磁性および構造の研究によって明らかにした,また,水素を一部重水素に置換した物質では常圧で金属-絶縁体-金属リエントランス転移が起こることを発見し,リエントランスの詳細を解体した。この系統の物質の金属-絶縁体転移の本質は,DCNQIのパイ電子バンドのフェルミ面不安定性に関係するバイエルス転移と,銅のd電子のバンドについてのモット転移であることを示した。この系では,低次元性,電子相関,電子格子相互作用,および圧力による弱い3次元性の介入のすべてが本質的な役割を哀じていると言える。

研究成果

(39件)

すべてその他

すべて文献書誌 (39件)

[文献書誌] S.Kagoshima,et at: "Magnetotransprt Studies of the Topology of Fermi Surface of the Quasi Two-Dimensional Organic Superconductor(BEDT-TTF)_2(NH_4)Hg-(SCN)_4,the Isostrctual Metal (BEDT-TTF)_2KHg(SCN)_4,and the Quasi" JJAP Serise 7,Mechanisms of Superconductivity. 381-389 (1992)
[文献書誌] T.Nakamura, et al: "FERMI SURFACE TOPOLOGY AND ELECTRONIC STRUCTURES OF TWO-DIMENSIONAL ORGANIC CONDUCTORS BASED ON BEDT-TTF AND MDT-TTF" Phosphorus,Sulfur,and Silicon. 67. 377-382 (1992)
[文献書誌] T.Osada,S.Kagoshima,and N.Miura: "Resonance effect in magnetotransport anisotropy of quasi--one-dimensiona conductors" Physical Review B. 46. 1812-1815 (1992)
[文献書誌] T.Osada, S.Kagoshima,and N.Miura: "FIELD-INDUCED SPIN-DENSITY-WAVE INSTABILETY OF THE ANISOTROPIC TWO-DI,ENSIONAL ELECTRON SYSTEM INDER LATRERAL SIPERLATTICE POTENTEAL" Phtsical Review Letters. 69. 1117-1120 (1992)
[文献書誌] T.Kouno, T.Osada, M.Hasumi,and S.Kagashima: "A NOVEL ELECTRONIC STATE IN(BEDT-TTF)_2XHg(SCN)_4;X=K,NH_4" Synthetic Metals,to be published.
[文献書誌] T.Sasaki, N.toyota: "Magnetic Phase Diagran of the Organic Conductor α-(BEDT-TTG)_2KHg(SCN)_4" Solid State Commun.82. 447-451 (1992)
[文献書誌] 徳本圓,A.Swanson,J.Brooks C.Agosta,S.Hananhs,木下信盛京安西弘行、田村雅史、田島裕之黒田晴雄、鵜川彰人、薬師久弥: "Fermi Surface Strface of Orgapic Netals(BEDT-TTF)_2X" Mat.Res.Soc.Symp.Proc.Electrlcal.Optical and Magnetic Properties of Orgnic Solid State Materials.Eds.L.Y.Chiang,A.F.Garito and D.J.Sandman. 247. 515-522 (1992)
[文献書誌] N.A.Fortune,村田恵三、池田久美、高橋梨宏: "Competitlon between Superconductivitu and a New 2OK Phase in β-(BEDT-TTF)_2I_3" Phys.Rev.Letters. 68. 2933-2936 (1992)
[文献書誌] J.Brooks,C.Agosta,S.Klepper 徳本圓、木下信盛、安西弘行宇治伸也、青木晴善、A.Perel G.Athas,D.Howe: "Novel Interplay of Fermi-Surface Bahavior and Magnetism in a Low-Dimensionl Organic Conductor" Phys. Rev. Letters. 69. 156-159 (1992)
[文献書誌] 木下信盛、田中康資、徳田圓松宮茂樹: "Superconductivity and Electron Spin tesonance in Cs-Doped C_<60>" Solid State Commun.83. 883-886 (1992)
[文献書誌] 関根久、前田弘、小菅通雄田中吉秋、徳本圓: "Magnetic Behavior and Structure of the Halogen-Doped Fullerene C_<60>" J.AppL.Phys. 72. 5448-5450 (1992)
[文献書誌] 石橋章司、寺田教男、徳本圓木下信盛、伊原英雄: "Positron States in C_<60> and Pottasium-Doped C_<60> Crystals" J. Phys.:Condensed Matter. 4. L169-L177 (1992)
[文献書誌] 石橋章司、徳本圓、木下信盛寺田教男、伊原英雄: "Positron States in β-(BEDT-TTF)_2I_3" Solid Stste Commun.85. 397-399 (1993)
[文献書誌] T.Ojiro, et al.: "An Anomalous Magnetoresistance in α-(BEDT-TTF)_2I_3 under High Pressure:A Possible New Phase" Physica B,to be published.
[文献書誌] M.Lang, N.Toyota T, Sasaki, H.Sato: "Matnetic penitration depth of κ-(BEDT-TTF)_2Cu(N(CN)_2)Bス, determined from the rdsersible nagnetization" Phys. Rev.B. 46. 5822-5825 (1992)
[文献書誌] M.Lang, N. Toyora, T. Sasakニ, H. Sato: "Magnetic penetration and of κ-(BEDT-TTF)_2Cu(NCS)_2: Strong evidence for cnoventionalCooper pairing" Phys. Rev. Lett.69. 1443-1447 (1992)
[文献書誌] Y.Nishio, et al: "Thermal and Magnetic Properties in Organic Metals (DMe-DCNQI)_2Cu, (DMeO-DCNQI)_2Cu and (DME_<1-x>MeBr_x-DCNQI)_2Cu" Solid State Commun.81. 472- (1992)
[文献書誌] T.Mishima, et al: "The Metal-Insulator Transiton in the Organic Conductor α-(BEDT-TTF)_2I_3---Viewed by Microwave" Synthetic Metals.
[文献書誌] H. Fujii, et al: "Sudden Disappearance of the Superconctivety of κ-(BEDT-TTF)_2Cu(SCN)_2" Synthetic Metals,.
[文献書誌] T.Ojiro, er al.: "A New Magneto-pressure Phase in α-(BDDT-TTF)_2I_3" Synthetic MetalS,.
[文献書誌] T.Takahashi, et al.: "Magnetism of DCNQI-Cu Salts" Synth. Met.
[文献書誌] K.Kanoda, et al.: "Magnetic Penetration Depth of the κ-Phase Family of Organic Superconductors" Synth. Met.
[文献書誌] K. Kanoda, et al.: "Upper Critical Field and NMR Relaxation of an Organic Superconductor, κ-(MDT-TTF)_2Aiu_2" Synth. Met.
[文献書誌] T. Takahashi, et al.: "Pressure Dependence of the SDW Transition in(MDT-TTF)_2-Au(CN)_2" Synth. Met.
[文献書誌] T.Takahashi, et al.: " _1H-NMR relaxation Anomaly at the Metal-Metal transition in the Slowly-Cooled (BEDT-TTF)_2C10_4(C_2H_3CL_3)_<0.5>" Synth.Met.
[文献書誌] T.Takahasi, et al.: " _1H-NMR Studies of the Low Temperature Phase of α-(BEDT-TTF)_2KHg(SCN)4"
[文献書誌] K.Kanoda, et al.: "Observation of de Haas-van Alphen Oscillations in (DMET)_2AuBr_2" Synth. Met.
[文献書誌] S.Kagoshima, et al: "Charge and Spin States of DCNQI-Cu Salts" Synth. Met.
[文献書誌] S.Murata, et al.: "Evidence for a 20K Transition in β-(BEDT-TTF)_2I_3" Xyznth. Met.
[文献書誌] T.Nakamura, et al.: "Transport Prooperties and Electronic Structure of the Novel Organic Superconductor κ-(BEDT-TTF)_2Cu(CN)[N(CN)_2](Tc=11.2K)" Synth.Met.
[文献書誌] H.Ito, et al.: "On superconductivity of the organic conductor α-(BEDT-TTF)_2KHg(SCN)_4" Solid State Commun.
[文献書誌] H.Ito, et al.: "Temperature Dependence of electrical conductivity of α-(BEDT-TTF)_2KHg(SCN)_4 below 1K:Possible electronic Phase change at 200mk" Xynthetic Metals.
[文献書誌] H.Ito, et al.: "Resistive Transition of κ-(BEDT-TTF)_2Cu[N(CN)_2]Br super-conductor under magnetic field" Synthetic Metals.
[文献書誌] K.Oshima, et al.: "XANES and EXAFS Study in(R_1R_2-DCNQI)_2Cu" JPN.J.Appl.Phys.
[文献書誌] K.Oshima, et al.: "The Field Induced Transitions in a Novel Organic System,(DMET-TSeF)_2AuI_2" Synthetic Metals.
[文献書誌] K. Oshima, et al.: "XANES Study and Valence States in)R_1_R-DCNQI)_2Cu" Synthetic Metals.
[文献書誌] S.Takada: "Nonlocal Unitary Trancsormation and String Order in S_21/2Heisenbery chain with Bond Alternation" J.Phys. Soc. JPN.61. 428-432 (1992)
[文献書誌] H.Shimahara,and S. Takada: "Fragility of the Antiferromagnetic Long-Rarge-Order and Spin Correlation in The Two Dimensional T-J Model" J. Phys. Soc. JPN.61. 989-997 (1992)
[文献書誌] T.Ishiguro and Y.Nogami: "Frontiers in Solid State Sciences. ed.by L.C.Gupta and M.S.Multani to be published." World Scientific,

1992 年度 実績報告書

有機導体における強い相関をもつ低次元電子系の研究

研究代表者

鹿児島 誠一 東京大学, 教養学部 教授 (30114432)

研究成果

[文献書誌] S.Kagoshima,et at: "Magnetotransprt Studies of the Topology of Fermi Surface of the Quasi Two-Dimensional Organic Superconductor(BEDT-TTF)_2(NH_4)Hg-(SCN)_4,the Isostrctual Metal (BEDT-TTF)_2KHg(SCN)_4,and the Quasi" JJAP Serise 7,Mechanisms of Superconductivity. 381-389 (1992)

[文献書誌] T.Nakamura, et al: "FERMI SURFACE TOPOLOGY AND ELECTRONIC STRUCTURES OF TWO-DIMENSIONAL ORGANIC CONDUCTORS BASED ON BEDT-TTF AND MDT-TTF" Phosphorus,Sulfur,and Silicon. 67. 377-382 (1992)

[文献書誌] T.Osada,S.Kagoshima,and N.Miura: "Resonance effect in magnetotransport anisotropy of quasi--one-dimensiona conductors" Physical Review B. 46. 1812-1815 (1992)

[文献書誌] T.Osada, S.Kagoshima,and N.Miura: "FIELD-INDUCED SPIN-DENSITY-WAVE INSTABILETY OF THE ANISOTROPIC TWO-DI,ENSIONAL ELECTRON SYSTEM INDER LATRERAL SIPERLATTICE POTENTEAL" Phtsical Review Letters. 69. 1117-1120 (1992)

[文献書誌] T.Kouno, T.Osada, M.Hasumi,and S.Kagashima: "A NOVEL ELECTRONIC STATE IN(BEDT-TTF)_2XHg(SCN)_4;X=K,NH_4" Synthetic Metals,to be published.

[文献書誌] T.Sasaki, N.toyota: "Magnetic Phase Diagran of the Organic Conductor α-(BEDT-TTG)_2KHg(SCN)_4" Solid State Commun.82. 447-451 (1992)

[文献書誌] N.A.Fortune,村田恵三、池田久美、高橋梨宏: "Competitlon between Superconductivitu and a New 2OK Phase in β-(BEDT-TTF)_2I_3" Phys.Rev.Letters. 68. 2933-2936 (1992)

[文献書誌] J.Brooks,C.Agosta,S.Klepper 徳本圓、木下信盛、安西弘行 宇治伸也、青木晴善、A.Perel G.Athas,D.Howe: "Novel Interplay of Fermi-Surface Bahavior and Magnetism in a Low-Dimensionl Organic Conductor" Phys. Rev. Letters. 69. 156-159 (1992)

[文献書誌] 木下信盛、田中康資、徳田 圓 松宮茂樹: "Superconductivity and Electron Spin tesonance in Cs-Doped C_<60>" Solid State Commun.83. 883-886 (1992)

[文献書誌] 関根 久、前田 弘、小菅通雄 田中吉秋、徳本 圓: "Magnetic Behavior and Structure of the Halogen-Doped Fullerene C_<60>" J.AppL.Phys. 72. 5448-5450 (1992)

[文献書誌] 石橋章司、寺田教男、徳本 圓 木下信盛、伊原英雄: "Positron States in C_<60> and Pottasium-Doped C_<60> Crystals" J. Phys.:Condensed Matter. 4. L169-L177 (1992)

[文献書誌] 石橋章司、徳本 圓、木下信盛 寺田教男、伊原英雄: "Positron States in β-(BEDT-TTF)_2I_3" Solid Stste Commun.85. 397-399 (1993)

[文献書誌] T.Ojiro, et al.: "An Anomalous Magnetoresistance in α-(BEDT-TTF)_2I_3 under High Pressure:A Possible New Phase" Physica B,to be published.

[文献書誌] M.Lang, N.Toyota T, Sasaki, H.Sato: "Matnetic penitration depth of κ-(BEDT-TTF)_2Cu(N(CN)_2)Bス, determined from the rdsersible nagnetization" Phys. Rev.B. 46. 5822-5825 (1992)

[文献書誌] M.Lang, N. Toyora, T. Sasakニ, H. Sato: "Magnetic penetration and of κ-(BEDT-TTF)_2Cu(NCS)_2: Strong evidence for cnoventionalCooper pairing" Phys. Rev. Lett.69. 1443-1447 (1992)

[文献書誌] Y.Nishio, et al: "Thermal and Magnetic Properties in Organic Metals (DMe-DCNQI)_2Cu, (DMeO-DCNQI)_2Cu and (DME_<1-x>MeBr_x-DCNQI)_2Cu" Solid State Commun.81. 472- (1992)

[文献書誌] T.Mishima, et al: "The Metal-Insulator Transiton in the Organic Conductor α-(BEDT-TTF)_2I_3---Viewed by Microwave" Synthetic Metals.

[文献書誌] H. Fujii, et al: "Sudden Disappearance of the Superconctivety of κ-(BEDT-TTF)_2Cu(SCN)_2" Synthetic Metals,.

[文献書誌] T.Ojiro, er al.: "A New Magneto-pressure Phase in α-(BDDT-TTF)_2I_3" Synthetic MetalS,.

[文献書誌] T.Takahashi, et al.: "Magnetism of DCNQI-Cu Salts" Synth. Met.

[文献書誌] K.Kanoda, et al.: "Magnetic Penetration Depth of the κ-Phase Family of Organic Superconductors" Synth. Met.

[文献書誌] K. Kanoda, et al.: "Upper Critical Field and NMR Relaxation of an Organic Superconductor, κ-(MDT-TTF)_2Aiu_2" Synth. Met.

[文献書誌] T. Takahashi, et al.: "Pressure Dependence of the SDW Transition in(MDT-TTF)_2-Au(CN)_2" Synth. Met.

[文献書誌] T.Takahashi, et al.: " _1H-NMR relaxation Anomaly at the Metal-Metal transition in the Slowly-Cooled (BEDT-TTF)_2C10_4(C_2H_3CL_3)_<0.5>" Synth.Met.

[文献書誌] T.Takahasi, et al.: " _1H-NMR Studies of the Low Temperature Phase of α-(BEDT-TTF)_2KHg(SCN)4"

[文献書誌] K.Kanoda, et al.: "Observation of de Haas-van Alphen Oscillations in (DMET)_2AuBr_2" Synth. Met.

[文献書誌] S.Kagoshima, et al: "Charge and Spin States of DCNQI-Cu Salts" Synth. Met.

[文献書誌] S.Murata, et al.: "Evidence for a 20K Transition in β-(BEDT-TTF)_2I_3" Xyznth. Met.

[文献書誌] T.Nakamura, et al.: "Transport Prooperties and Electronic Structure of the Novel Organic Superconductor κ-(BEDT-TTF)_2Cu(CN)[N(CN)_2](Tc=11.2K)" Synth.Met.

[文献書誌] H.Ito, et al.: "On superconductivity of the organic conductor α-(BEDT-TTF)_2KHg(SCN)_4" Solid State Commun.

[文献書誌] H.Ito, et al.: "Temperature Dependence of electrical conductivity of α-(BEDT-TTF)_2KHg(SCN)_4 below 1K:Possible electronic Phase change at 200mk" Xynthetic Metals.

[文献書誌] H.Ito, et al.: "Resistive Transition of κ-(BEDT-TTF)_2Cu[N(CN)_2]Br super-conductor under magnetic field" Synthetic Metals.

[文献書誌] K.Oshima, et al.: "XANES and EXAFS Study in(R_1R_2-DCNQI)_2Cu" JPN.J.Appl.Phys.

[文献書誌] K.Oshima, et al.: "The Field Induced Transitions in a Novel Organic System,(DMET-TSeF)_2AuI_2" Synthetic Metals.

[文献書誌] K. Oshima, et al.: "XANES Study and Valence States in)R_1_R-DCNQI)_2Cu" Synthetic Metals.

[文献書誌] S.Takada: "Nonlocal Unitary Trancsormation and String Order in S_21/2Heisenbery chain with Bond Alternation" J.Phys. Soc. JPN.61. 428-432 (1992)

[文献書誌] H.Shimahara,and S. Takada: "Fragility of the Antiferromagnetic Long-Rarge-Order and Spin Correlation in The Two Dimensional T-J Model" J. Phys. Soc. JPN.61. 989-997 (1992)

[文献書誌] T.Ishiguro and Y.Nogami: "Frontiers in Solid State Sciences. ed.by L.C.Gupta and M.S.Multani to be published." World Scientific,

1992 年度実績報告書

鹿児島誠一東京大学, 教養学部教授 (30114432)

[文献書誌] J.Brooks,C.Agosta,S.Klepper 徳本圓、木下信盛、安西弘行宇治伸也、青木晴善、A.Perel G.Athas,D.Howe: "Novel Interplay of Fermi-Surface Bahavior and Magnetism in a Low-Dimensionl Organic Conductor" Phys. Rev. Letters. 69. 156-159 (1992)

[文献書誌] 木下信盛、田中康資、徳田圓松宮茂樹: "Superconductivity and Electron Spin tesonance in Cs-Doped C_<60>" Solid State Commun.83. 883-886 (1992)

[文献書誌] 関根久、前田弘、小菅通雄田中吉秋、徳本圓: "Magnetic Behavior and Structure of the Halogen-Doped Fullerene C_<60>" J.AppL.Phys. 72. 5448-5450 (1992)

[文献書誌] 石橋章司、寺田教男、徳本圓木下信盛、伊原英雄: "Positron States in C_<60> and Pottasium-Doped C_<60> Crystals" J. Phys.:Condensed Matter. 4. L169-L177 (1992)

[文献書誌] 石橋章司、徳本圓、木下信盛寺田教男、伊原英雄: "Positron States in β-(BEDT-TTF)_2I_3" Solid Stste Commun.85. 397-399 (1993)