1995 Fiscal Year Annual Research Report

有機導体の低次元電子相と電子相関

Research Project

Project/Area Number	05402009
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)	斉藤軍治京都大学, 大学院・理学研究科, 教授 (40132724) 加藤礼三東京大学, 物性研究所, 助教授 (80169531) 長田俊人東京大学, 先端科学技術研究センター, 講師 (00192526) 和田信雄東京大学, 教養学部, 助教授 (90142687)
Keywords	有機導体 / 低次元電子系 / BEDT-TTF / TMTSF / DCNQI / フェルミ面 / 磁気抵抗 / スピン密度波
Research Abstract	この研究の目的は,原子よりも構造的に複雑な分子をベースとして作られる低次元性有機導体において,電流の担い手となる低次元電子系の構造とダイナミクスを,物理学と有機物理化学との緊密な協力のもとに解明することである。具体的には,BEDT-TTF分子,TMTSF分子およびDCNQI分子などを母体とする2次元・1次元性導体を対象とし,磁場誘起スピン密度波などの反強磁性相,電子系の“重く"なった状態など,電子相関と低次元性の絡み合った電子状態の本質を解明する。本年度は,擬1次元性と擬2次元性を併せ持つと考えられる(BEDT-TTF)2KHg(SCN)4の低温・低磁場・低圧領域での異常相の解明においては,異常相と高圧正常相との関係を明らかにし,正常相から異常相への移り変わりの様相をフェルミ面形状の立場から解明した。しかし,今までの理論では理解できない新たな磁気抵抗の振動を発見したので,現在その起因を考察中である。また,擬1次元性をもつTMTSF系物質の磁場下の電子状態の解明では,(TMTSF)2PF6,(TMTSF)2AsF6のスピン密度波多相状態について,0.5Kまで,温度・圧力をパラメターとして,パルス伝導度測定によってスピン密度波の運動に伴う誘電緩和に似た実験データを得た。この原因の解決は来年度の課題である。DCNQI系物質の金属-絶縁体-金属再入転移の起因の解明については,当初の研究目的をほぼ達成し,本年度はとりまとめを開始した。

Research Products

(21 results)

All Other

All Publications (21 results)

[Publications] T.Komatsu: "The Electrical and 〈Magnetic Properties of a Novel Two-Dimenssional Anti-ferromagnet 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 pristine and fully deuterared (DMeDCNQI)_2Cu" Synth.Met.70. 1065-1068 (1995)
[Publications] T.Osada: "Density wave v.s.Magnetic Breakdown:Mechanism of High-Field Phase Transition 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] T.Imakubo: "Novel Cation Radical Salts Organic π-Donors Containing IodineAtom(s):The First Application of strong Intermolecular--l・・・X--(X=CN,halogen atom)Interaction to Molecular Conductors" Synth.Met.73. 117-122 (1995)
[Publications] T.Imakubo: "Synthesis and Crystal Structure of the Molecular Metal Based on Iodine-bonded π-Donor,(IEDT)[Pd(dmit)_2]" J.C.S.Chem.Commun.11. 1097-1098 (1995)
[Publications] T.Imakubo: "Novel Molecular Conductors,(DIETS)_4M(CN)_4[M=Ni,Pd,Pd]:Highly Reticulated Donor・・・Anion Contacys by--l・・・NC--Interaction" J.C.S.Chem.Commun.16. 1667-1668 (1995)
[Publications] T.Imakubo: "New Molecular Conductors Containing Magnetic Tetrahedral Anion,(DIETS)_2FeX_4 and (DIETS)FeX_4" Mol.Cryst.Liq.Cryst.(in pess).
[Publications] R.Kato: "Structures and Properties of New Molecular Conductors Based on Pd(dmise)_2" Solid State Commun.94-12. 973-977 (1995)
[Publications] S.Takayanagi: "The Specific Heat of Single Crystal NdCu_2" Physica B. 206&207. 395-397 (1995)
[Publications] K.Agawa: "Crystal structures and Magnetic Properties of (m-Pyridium Nitronyl Nitroxide)^+・X^-:Possible Spin-1 Kagome Antiferromagnet" Synth.Metals. 71. 1807-1808 (1995)
[Publications] S.Miyajima: "Solid State High Resolution 13C NMR Study of the Intermolecular Interaction in Organic Semiconductors TTCn-TTF" J.Phys.Chem.99(1). 1582-1586 (1995)
[Publications] H.Poseselt: "Meissner Effect in κ-ET_2Cu[N(CN)_2]Cl under Pressure;Observation of Complete Reentrant" Physica B. 204. 159-161 (1995)
[Publications] T.Akutagawa: "Multi Electron and Proton-Transfer Sustem Based on 2,2'-Biimidazole Derivatives" Synth.Metals. 69. 591-592 (1995)
[Publications] H.Ito: "Superconductivity in α-(BEDT-TTF)_2MHg(SCN)_4(M=K,Rb,TI,NH_4)" Synth.Metals. 70. 899-902 (1995)
[Publications] Yu.V.Sushko: "κ-(BEDT-TTF)_2Cu[N(CN)_2]Cl:Magnet and Superconductor.High Pressure and High Magnetic Field Experiments" Synth.Metals. 70. 907-910 (1995)
[Publications] H.Ito: "Anisotropic ac Field Screening of Superconducting κ-(BEDT-TTF)_2Cu[N(CN)_2]X(X=Br,Cl)" Synth.Metals. 70. 923-924 (1995)
[Publications] H.Ito: "Temperature-pressure Phase Diagrams of Hydrogenated and Deuterated κ-(BEDT-TTF)_2Cu[N(CN)_2]Cl" Synth.Metals. 70. 925-926 (1995)
[Publications] Yu.V.Sushko: "Static,Magnetization Study of κ-(BEDT-TTF)_2Cu[N(CN)_2]Cl under High Pressure.Part 1.High Magnetic Fields" Synth.Metals. 70. 937-938 (1995)

1995 Fiscal Year Annual Research Report

有機導体の低次元電子相と電子相関

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 Anti-ferromagnet 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 pristine and fully deuterared (DMeDCNQI)_2Cu" Synth.Met.70. 1065-1068 (1995)

[Publications] T.Osada: "Density wave v.s.Magnetic Breakdown:Mechanism of High-Field Phase Transition 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] T.Imakubo: "Novel Cation Radical Salts Organic π-Donors Containing IodineAtom(s):The First Application of strong Intermolecular--l・・・X--(X=CN,halogen atom)Interaction to Molecular Conductors" Synth.Met.73. 117-122 (1995)

[Publications] T.Imakubo: "Synthesis and Crystal Structure of the Molecular Metal Based on Iodine-bonded π-Donor,(IEDT)[Pd(dmit)_2]" J.C.S.Chem.Commun.11. 1097-1098 (1995)

[Publications] T.Imakubo: "Novel Molecular Conductors,(DIETS)_4M(CN)_4[M=Ni,Pd,Pd]:Highly Reticulated Donor・・・Anion Contacys by--l・・・NC--Interaction" J.C.S.Chem.Commun.16. 1667-1668 (1995)

[Publications] T.Imakubo: "New Molecular Conductors Containing Magnetic Tetrahedral Anion,(DIETS)_2FeX_4 and (DIETS)FeX_4" Mol.Cryst.Liq.Cryst.(in pess).

[Publications] R.Kato: "Structures and Properties of New Molecular Conductors Based on Pd(dmise)_2" Solid State Commun.94-12. 973-977 (1995)

[Publications] S.Takayanagi: "The Specific Heat of Single Crystal NdCu_2" Physica B. 206&207. 395-397 (1995)

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

[Publications] S.Miyajima: "Solid State High Resolution 13C NMR Study of the Intermolecular Interaction in Organic Semiconductors TTCn-TTF" J.Phys.Chem.99(1). 1582-1586 (1995)

[Publications] H.Poseselt: "Meissner Effect in κ-ET_2Cu[N(CN)_2]Cl under Pressure;Observation of Complete Reentrant" Physica B. 204. 159-161 (1995)

[Publications] T.Akutagawa: "Multi Electron and Proton-Transfer Sustem Based on 2,2'-Biimidazole Derivatives" Synth.Metals. 69. 591-592 (1995)

[Publications] H.Ito: "Superconductivity in α-(BEDT-TTF)_2MHg(SCN)_4(M=K,Rb,TI,NH_4)" Synth.Metals. 70. 899-902 (1995)

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

[Publications] H.Ito: "Anisotropic ac Field Screening of Superconducting κ-(BEDT-TTF)_2Cu[N(CN)_2]X(X=Br,Cl)" Synth.Metals. 70. 923-924 (1995)

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

[Publications] Yu.V.Sushko: "Static,Magnetization Study of κ-(BEDT-TTF)_2Cu[N(CN)_2]Cl under High Pressure.Part 1.High Magnetic Fields" Synth.Metals. 70. 937-938 (1995)

鹿児島誠一東京大学, 教養学部, 教授 (30114432)