1995 Fiscal Year Annual Research Report

分子性物質の電子相関と電子構造

Research Project

Project/Area Number	06243102
Research Institution	The University of Tokyo
Principal Investigator	鹿児島誠一東京大学, 教養学部, 教授 (30114432)
Co-Investigator(Kenkyū-buntansha)	薬師久弥岡崎国立共同機構, 分子科学研究所, 教授 (20011695) 豊田直樹大阪府立大学, 先端科学研究所, 教授 (50124607) 大嶋孝吉岡山大学, 理学部, 教授 (10114414) 石黒武彦京都大学, 大学院・理学研究科, 教授 (50202982) 池畑誠一郎東京大学, 大学院・理学系研究科, 助教授 (30107685)
Keywords	分子性導体 / 超伝導 / 有機超伝導体 / 超伝導局在現象 / 分子性低次元導体 / 角度依存磁気抵抗振動 / 異常相 / 光電子スペクトル測定
Research Abstract	本計画研究の主要な目的は、分子性導体の電子構造と荷電担体のダイナミクスを解明することである。まず超伝導については,極低温での^<13>CのNMRと電子比熱測定によって,非s波的な超伝導電子対の存在を支持する結果を得た。この実験では、試料の2次元面に極めて平行に磁場を加えるという巧妙な操作により,磁束が試料の伝導層間を通るように制御して信頼性のある結果を得た。また有機超伝導体として最高の臨界温度をもつBEPT-TTF系物質について,圧力・温度相図を明らかにし,有機超伝導帯において超伝導局在現象が生じることを初めて明らかにした。分子性低次元導体の低次元フェルミ面付近の電子構造とそのダイナミクスを明らかにするため,強磁場下の伝導測定などにより,一群の擬1次元,擬2次元性有機超伝導体のフェルミ面の構造を明らかにした。擬1次元導体の測定では,「第3の角度依存磁気抵抗振動」とも言うべき現象を発見し,その起因を理論的に説明することに成功した。また,(BEDT-TTF)_2KHg(SCN)_4のいわゆる異常相の解明においては,ミュー中間子共鳴によって内部磁場を検出し,反強磁性を生み出している磁気モーメントの実効値がO.001ボ-ア磁子程度にすぎないことを明らかにした。角度依存磁気抵抗振動の測定では,異常相で原因不明の磁気抵抗振動があることを発見した。その起因の解明を進めている。DCNQI系物質の研究では,金属-絶縁体転移が1次転移であることを潜熱測定によって明らかにした。また,光電子スペクトル測定などによって,電子エネルギー構造のフェルミ面付近の詳細を解明することに成功した。

Research Products

(35 results)

All Other

All Publications (35 results)

[Publications] T.Komatsu: "The Electrical and <Magnetic Properties of a Novel Two-Dimenssional Antiferromagnet Based on BEDT-TTF:thetra-(BEDT-TTF)_2Cu_2(CN)[N(CN)_2]_2" Bull.Chem.Soc.Jpn. 68-8. 2233-2244 (1995)
[Publications] H.Yamaguchi: "Anomalies in the Pulsed Photoconductivity of Undoped C60 and their Relationship to Phase Transitions" J.Phys.Soc.Jpn. 64-2. 527-532 (1995)
[Publications] S.Kagoshima: "Magnetic-field effects on the reentrance transition of alloy of prtstine and fully deuterared (DMeDCNQl)_2Cu" Synth.Met.70. 1065-1068 (1995)
[Publications] T.Osada: "Density wave v.s.Magnetic Breakdown:Mechanism of High-Field Phase Transtion in alpha-(BEDT-TTF)_2XHg(SCN)_4" Synth.Met. 70. 931-934 (1995)
[Publications] T.Komatsu: "Structural and Physical Properties of Theta-(BEDT-TTF)_2Cu_2(CN)[N(CN)_2]_2" Synth.Met. 70. 779-780 (1995)
[Publications] H.Shinagawa: "Effects of the anion ordering superlattice on the rapid oscillations'in(TMTSF)_2X" Synth.Met. 70. 759-760 (1995)
[Publications] G.Yu.Logvenov: "Magnetic Oscilation of Theromoelectric power in the Organic PUperconductor κ-(BEDT-TTF)_2Cu(NCS)_2" J.Phys.Soc.Jpn.64-10. 3622-3625 (1995)
[Publications] M.V.Kartsovnik: "Shubunikov-de Haas Oscillations in the Organic Superconductor κ-(BEDT-TTF)_2-Cu[N(CN)_2]Br where BEDT-TTF is bis (ethlenedithio)tetrathiiafulvalene" Phys.Rev.B. 52-22. 15715-15718 (1995)
[Publications] M.V.Kartsovnik: "Magnrtec Field Studies of the Peculiar Electronic State in the α-(BEDT-TTF)_2-MHg(SCN)_4 Family" Phys.Metals. 70. 811-814 (1995)
[Publications] M.V.Kartsovnik: "Magnetoresistance Anisotropy in the Organic Superconductor κ-(BEDT-TTF)_2-Cu(NCS)_4" Phys.Metals. 70. 819-820 (1995)
[Publications] H.Ito: "Superconductivity in α-(BEDT-TTF)_2NHg(SCN)_4(M=K,Pb,TI,NH_4)" Synth.Metals. 70. 899-902 (1995)
[Publications] Yu.V.Sushko: "κ-(BEDT-TTF)_2Cu[N(CN)_2]Cu:Magnet and Superconductor High Pressure and High Magnetic Field Experiments" Synth.Metals. 70. 907-910 (1995)
[Publications] H.Ito: "Anisotropic a.c.Field Screening of Superconducting κ-(BEDT-TTF)_2-Cu[N(CN)_2]X(X=Br,Cl)" Synth.Metals. 70. 923-924 (1995)
[Publications] H.Ito: "Temperature-Pressure Phaoe Diagram of Hydrogenated and Deuterated κ-(BEDT-TTF)_2Cu[N(CN)_2]Cl" Synth.Metals. 70. 925-926 (1995)
[Publications] Y.Yamauchi: "Angle-Dependent Magnetoresistance and Shubnikov-de Haas Oscillations in the Organic Superconductor κ-(BEDT-TTF)_2-Cu[N(CN)_2]Cl under Pressure" J.Phys.Soc.Jpn.(in press).
[Publications] K.Oshima: "Superconductivity and Field Induced in DMET-TSeF family" Synth.Metals. 70. 861-862 (1995)
[Publications] K.Oshima: "Field Induced States and Hysteresis Effect in (DMET-TSeF)_2Aul_2" Synthtic.Metals. 70. 863-864 (1995)
[Publications] Y.Kubozono: "Preparation and Extraction of CaC_<60>" Chemistry Letters. 1995. 457-458 (1995)
[Publications] T.Fujimoto: "Local Structure around Cs+Ion in Na_2CsC_<60> Superconductor" Fullerene Science & Technology. 3-4. 419-428 (1995)
[Publications] K.oshima: "Ferromagnetic Resonance in p-NPNN belo 1K" Mol.Cryst.Liq.Cryst.271. 29-34 (1995)
[Publications] T.Moshima: "Temperature independent conductivity of α-(BEDT-TTF)_2l_3-compensation of the change in the carrier and mobility-" Synth.Metals. 70. 771-777 (1995)
[Publications] 長田俊人: "磁場により誘起されるスピン密度波とその遂次転移" 日本物理学会誌. 50. 192-201 (1995)
[Publications] 長田俊人: "分子導体におけるマグネティック・ブレークダウンと磁場誘起電子相転移" 固体物理. 30-10. 843-858 (1995)
[Publications] T.Tega: "Magnetic and Thermal Properties under uniaxial Stress of (DMe-DCNQl)_2Cu" Synth.Metals. 70. 1953-1954 (1995)
[Publications] A.Kawamoto: "13C-NMR Study of Layered Organic Superonductors Based on BEDT-TTF Molecuies" Phys.Rev.Lett.74. 3455-3458 (1995)
[Publications] K.Miyagawa: "Antiferromagnetic Ordering and Spin Structure in the Organic Conductor,κ-(BEDT-TTF)_2Cu[N(CN)_2]Cl" Phys.Rev.Lett.75. 1174-1177 (1995)
[Publications] T.Sekine: "Low-Frequency Raman Specta in κ-(BEDT-TTF)_2D2Cu(NCS)_2and κ-(BEDT-TTF)_2-Cu[N(CN)_2]_2]Br" Synth.Metals. 70. 981-982 (1995)
[Publications] A.Tanaka: "Electronic Structure of the quasi-one dimensional organic conductors DCNQl (N,N′-dicyanoquinonediimine)-Cu salts" Phys.Rev.B. 52. 7951-7959 (1995)
[Publications] T.Takahashi: "Cooperative effects of electron correlation and charge ordering on the M-l transiton in quasi 1-dimensional deutrated(DMe-DCNQl)_2Cu" Phys.Rev.B. 53. 1790-1794 (1996)
[Publications] T.Nakamura: "Anomalous Enhancement of g-shift in k-type BEDT-TTF Compounds" Synth.Metals. 70. 959-962 (1995)
[Publications] T.Nakamura: "1H-NMR Inverstigation of the SDW Wave-Number in (TMTTF)_2Br" Synth.Meltals. 70. 1293-1294 (1995)
[Publications] F.Pratt: "Zero field muon spin relaxation study of the low temperture state in α-(BEDT-TTF)_2KHg(SCN)_4" Phys.Rev.Lett.74. 3892-3895 (1995)
[Publications] T.Sasaki: "Mysterious ground states in the organic conductor α-(BEDT-TTF)_2KHg(SCB)_4]:Mixed SDW and CDW?" Synth.Met.70. 849-852 (1995)
[Publications] T.Hiejima: "Pressure-induced d-π charge transfer in One-dimensional Phthalocyanine conductors,NiPc(AsF_6)_<0.5> and Copc(AsF_6)_<0.5>" J.Chem.Phys.103. 3950-3959 (1995)
[Publications] K.Awaga: "Crystal structues and Magnetic Properties of (m-Pyridium Nitronyl Nitroxide)^+・X^-:Possible Spin-1 Kagome Antiferromagnet" Synth.Metals. 71. 1807-1808 (1995)

1995 Fiscal Year Annual Research Report

分子性物質の電子相関と電子構造

Principal Investigator

鹿児島 誠一 東京大学, 教養学部, 教授 (30114432)

Research Products

[Publications] T.Komatsu: "The Electrical and <Magnetic Properties of a Novel Two-Dimenssional Antiferromagnet Based on BEDT-TTF:thetra-(BEDT-TTF)_2Cu_2(CN)[N(CN)_2]_2" Bull.Chem.Soc.Jpn. 68-8. 2233-2244 (1995)

[Publications] H.Yamaguchi: "Anomalies in the Pulsed Photoconductivity of Undoped C60 and their Relationship to Phase Transitions" J.Phys.Soc.Jpn. 64-2. 527-532 (1995)

[Publications] S.Kagoshima: "Magnetic-field effects on the reentrance transition of alloy of prtstine and fully deuterared (DMeDCNQl)_2Cu" Synth.Met.70. 1065-1068 (1995)

[Publications] T.Osada: "Density wave v.s.Magnetic Breakdown:Mechanism of High-Field Phase Transtion in alpha-(BEDT-TTF)_2XHg(SCN)_4" Synth.Met. 70. 931-934 (1995)

[Publications] T.Komatsu: "Structural and Physical Properties of Theta-(BEDT-TTF)_2Cu_2(CN)[N(CN)_2]_2" Synth.Met. 70. 779-780 (1995)

[Publications] H.Shinagawa: "Effects of the anion ordering superlattice on the rapid oscillations'in(TMTSF)_2X" Synth.Met. 70. 759-760 (1995)

[Publications] G.Yu.Logvenov: "Magnetic Oscilation of Theromoelectric power in the Organic PUperconductor κ-(BEDT-TTF)_2Cu(NCS)_2" J.Phys.Soc.Jpn.64-10. 3622-3625 (1995)

[Publications] M.V.Kartsovnik: "Shubunikov-de Haas Oscillations in the Organic Superconductor κ-(BEDT-TTF)_2-Cu[N(CN)_2]Br where BEDT-TTF is bis (ethlenedithio)tetrathiiafulvalene" Phys.Rev.B. 52-22. 15715-15718 (1995)

[Publications] M.V.Kartsovnik: "Magnrtec Field Studies of the Peculiar Electronic State in the α-(BEDT-TTF)_2-MHg(SCN)_4 Family" Phys.Metals. 70. 811-814 (1995)

[Publications] M.V.Kartsovnik: "Magnetoresistance Anisotropy in the Organic Superconductor κ-(BEDT-TTF)_2-Cu(NCS)_4" Phys.Metals. 70. 819-820 (1995)

[Publications] H.Ito: "Superconductivity in α-(BEDT-TTF)_2NHg(SCN)_4(M=K,Pb,TI,NH_4)" Synth.Metals. 70. 899-902 (1995)

[Publications] Yu.V.Sushko: "κ-(BEDT-TTF)_2Cu[N(CN)_2]Cu:Magnet and Superconductor High Pressure and High Magnetic Field Experiments" Synth.Metals. 70. 907-910 (1995)

[Publications] H.Ito: "Anisotropic a.c.Field Screening of Superconducting κ-(BEDT-TTF)_2-Cu[N(CN)_2]X(X=Br,Cl)" Synth.Metals. 70. 923-924 (1995)

[Publications] H.Ito: "Temperature-Pressure Phaoe Diagram of Hydrogenated and Deuterated κ-(BEDT-TTF)_2Cu[N(CN)_2]Cl" Synth.Metals. 70. 925-926 (1995)

[Publications] Y.Yamauchi: "Angle-Dependent Magnetoresistance and Shubnikov-de Haas Oscillations in the Organic Superconductor κ-(BEDT-TTF)_2-Cu[N(CN)_2]Cl under Pressure" J.Phys.Soc.Jpn.(in press).

[Publications] K.Oshima: "Superconductivity and Field Induced in DMET-TSeF family" Synth.Metals. 70. 861-862 (1995)

[Publications] K.Oshima: "Field Induced States and Hysteresis Effect in (DMET-TSeF)_2Aul_2" Synthtic.Metals. 70. 863-864 (1995)

[Publications] Y.Kubozono: "Preparation and Extraction of CaC_<60>" Chemistry Letters. 1995. 457-458 (1995)

[Publications] T.Fujimoto: "Local Structure around Cs+Ion in Na_2CsC_<60> Superconductor" Fullerene Science & Technology. 3-4. 419-428 (1995)

[Publications] K.oshima: "Ferromagnetic Resonance in p-NPNN belo 1K" Mol.Cryst.Liq.Cryst.271. 29-34 (1995)

[Publications] T.Moshima: "Temperature independent conductivity of α-(BEDT-TTF)_2l_3-compensation of the change in the carrier and mobility-" Synth.Metals. 70. 771-777 (1995)

[Publications] 長田俊人: "磁場により誘起されるスピン密度波とその遂次転移" 日本物理学会誌. 50. 192-201 (1995)

[Publications] 長田俊人: "分子導体におけるマグネティック・ブレークダウンと磁場誘起電子相転移" 固体物理. 30-10. 843-858 (1995)

[Publications] T.Tega: "Magnetic and Thermal Properties under uniaxial Stress of (DMe-DCNQl)_2Cu" Synth.Metals. 70. 1953-1954 (1995)

[Publications] A.Kawamoto: "13C-NMR Study of Layered Organic Superonductors Based on BEDT-TTF Molecuies" Phys.Rev.Lett.74. 3455-3458 (1995)

[Publications] K.Miyagawa: "Antiferromagnetic Ordering and Spin Structure in the Organic Conductor,κ-(BEDT-TTF)_2Cu[N(CN)_2]Cl" Phys.Rev.Lett.75. 1174-1177 (1995)

[Publications] T.Sekine: "Low-Frequency Raman Specta in κ-(BEDT-TTF)_2D2Cu(NCS)_2and κ-(BEDT-TTF)_2-Cu[N(CN)_2]_2]Br" Synth.Metals. 70. 981-982 (1995)

[Publications] A.Tanaka: "Electronic Structure of the quasi-one dimensional organic conductors DCNQl (N,N′-dicyanoquinonediimine)-Cu salts" Phys.Rev.B. 52. 7951-7959 (1995)

[Publications] T.Takahashi: "Cooperative effects of electron correlation and charge ordering on the M-l transiton in quasi 1-dimensional deutrated(DMe-DCNQl)_2Cu" Phys.Rev.B. 53. 1790-1794 (1996)

[Publications] T.Nakamura: "Anomalous Enhancement of g-shift in k-type BEDT-TTF Compounds" Synth.Metals. 70. 959-962 (1995)

[Publications] T.Nakamura: "1H-NMR Inverstigation of the SDW Wave-Number in (TMTTF)_2Br" Synth.Meltals. 70. 1293-1294 (1995)

[Publications] F.Pratt: "Zero field muon spin relaxation study of the low temperture state in α-(BEDT-TTF)_2KHg(SCN)_4" Phys.Rev.Lett.74. 3892-3895 (1995)

[Publications] T.Sasaki: "Mysterious ground states in the organic conductor α-(BEDT-TTF)_2KHg(SCB)_4]:Mixed SDW and CDW?" Synth.Met.70. 849-852 (1995)

[Publications] T.Hiejima: "Pressure-induced d-π charge transfer in One-dimensional Phthalocyanine conductors,NiPc(AsF_6)_<0.5> and Copc(AsF_6)_<0.5>" J.Chem.Phys.103. 3950-3959 (1995)

[Publications] K.Awaga: "Crystal structues and Magnetic Properties of (m-Pyridium Nitronyl Nitroxide)^+・X^-:Possible Spin-1 Kagome Antiferromagnet" Synth.Metals. 71. 1807-1808 (1995)

鹿児島誠一東京大学, 教養学部, 教授 (30114432)