1989 Fiscal Year Annual Research Report

高温有機超伝導体の開発

Research Project

Project/Area Number	63060004
Research Institution	Tokyo Metropolitan University
Principal Investigator	池本勲東京都立大学, 理学部, 教授 (00011601)
Co-Investigator(Kenkyū-buntansha)	齋藤軍治京都大学, 理学部, 教授 (40132724)
Keywords	有機超伝導体 / ラジカル塩 / BEDTーTTF / DMET / 非対称電子供与体 / 電気伝導度 / 相転移 / 同位体効果
Research Abstract	有機超伝導体を与える非対称な電子供与体DMETのラジカル塩についてさらにいくつか結晶構造を明らかにした。また熱起電力の温度変化を測定し、電荷担体を明らかにするとともに結晶の示す電気伝導度との関係を調べた。BF_4塩の電気伝導度に現れる金属ー半導体転移も熱起電力の温度変化と対応した。新しい系としてDMETの誘導体であるDMPTおよび有機超伝導体を与えるもう一つの非対称電子供与体MDTーTTFとその誘導体であるEDTーTTFのラジカル塩を作成した。新しい金属的電気伝導を示すものを得たが、新しい超伝導体は出現しなかった。これらの塩について単結晶赤外偏光反射スペクトルを測定し、結晶構造に見られる構造の次元性との関係を調べた。κー(BEDTーTTF)_2Cu(NCS)_2についてはBEDTーTTFの二つの外側エチレン基の^<12>Cをすべて^<13>Cに置換した塩(^<13>C体)のTcがH体とD体の中間に位置することを見いだした。外側のエチレン基の原子置換により逆同位体効果が見られたことはエチレン基のなんらかの振動またはエチレン基・アニオンのなんらかの相互作用がこの系の超伝導に寄与していることが明らかとなった。(BEDTーTTF)_2Cu(NCS)_2の類縁体については多数の錯体をスクリーン探索し、その中から有望と考えられる組合せについてより詳しい物性、構造研究を行った。さきに作成した(BEDTーTTF)_2[NH_4Hg(SCN)_4]が米国でrf侵入法により超伝導体であることが報告された。Tcが1K近傍であったため我々のスクリーン探索で検出出来なかったことは残念である。伝導度測定により超伝導を確認し(Tc=0.8K)、結晶構造、シュブニコフ・ドハース効果、角度依存量子振動効果なども調べた。また以前作成したBEDOーTTFのCu(SCN)_2錯体においても米国においてrf侵入法で検出された。これら二つの錯体が我々が既にかなり以前に作成していたことを考えると、今後rf侵入法のように超伝導を0.5Kまで簡便に検出出来る装置の作成が必要である。

Research Products

(21 results)

All Other

All Publications (21 results)

[Publications] Y.Ishikawa: "Structure of the Organic Superconductor(DMET)_2AuI_2" Acta Crystallogr.C45. 572-575 (1989)
[Publications] K.Kanoda: "Anomalous Spin Dynamics of Conduction Electrons in the Organic Conductor,[dimethyl(ethylenedithio)diselenadithiafulvalene]_2AuBr_2[(DMET)_2AuBr_2]" Solid State Commun.68. 415-418 (1989)
[Publications] K.Kanoda: "EPR Studies of a New Family of Organic Conductors:The dimethyl(ethylenedithio)-diselenadithiafulvalene compounds(DMET)_2X[X=PF_6,BF_4,Au(CN)_2,I_3 and AuBr_2]" Phys.Rev.B39. 3996-4003 (1989)
[Publications] K.Saito: "Phase Transition of(DMET)_2Au(CN)_2 at 180K" J.Phys.:Condensed Matt.1. 8823-8829 (1989)
[Publications] K.Saito: "First Unsymmetrical Donor Which Gives Organic Superconductors:DMET" Acta Crystallogr.C45. 1403-1405 (1989)
[Publications] K.Saito: "Thermoelectric Power and Order-Parameter Associated with the Phase Transition at 180K of the Organic Metal,(DMET)_2Au(CN)_2" J.Phys.Soc Jpn.58. 4093-4097 (1989)
[Publications] Y.Honda: "Phase Diagram of Superconductivity and Spin Density Wave in(DMET)_2Au(CN)_2" Solid State Commun.71. 1087-1092 (1989)
[Publications] M.Oshima: "Crystal Structures and Electrical Properties of BEDT-TTF Salts of Mercury(II)Thiocyanate with and without K Ion" Chem.Lett.1989. 1159-1162 (1989)
[Publications] Y.Iwasa: "Intrinsic Negative-Resistance Effect in Mixed-Stack Charge-Transfer Crystals" Phys.Rev.B. 39. 10441-10444 (1989)
[Publications] Y.Iwasa: "Switching Effect in Organic Charge Transfer Complex Crystals" Appl.Phys.Lett.55. 2111-2113 (1989)
[Publications] Y.Tokura: "Domain-wall Dynamics in Organic Charge-Transfer Compounds with One-dimensional Ferroelectricity" Phys.Rev.Lett.63. 2045-2408 (1989)
[Publications] T.Osada: "Non-Ohmic Conduction in the Magnetic Field Induced Spin Density Wave State" Synth.Metals. 29. F305-F312 (1989)
[Publications] S.Kagoshima: "A Change of the Superstructure and an Associated Rise of the Superconducting Critical Temperature in the Organic Superconductor βー(BEDT-TTF)_2I_3" Solid State Commun.69. 1177-1180 (1989)
[Publications] G.Saito: "Chemical and Physical Properties of Organic Superconductor κー(BEDT-TTF)_2Cu(NCS)_2" Advances in Superconductivity Kitazawa-Ishiguro Eds.Springer-Verlag. 107-112 (1989)
[Publications] H.Urayama: "Organic Metals and Superconductors Based on BEDT-TTF" Advances in Superconductivity Kitazawa-Ishiguro Eds.Springer-Verlag. 113-118 (1989)
[Publications] K.Kanoda: "Complex Susceptibility and Penetration Depth of the Organic Superconductor,(BEDT-TTF)_2Cu(NCS)_2" Physica. C162ー164. 405-406 (1989)
[Publications] G.Saito: "An Overview of an Organic Superconductor:κー(BEDT-TTF)_2Cu(NCS)_2" Physica. C162ー164. 577-582 (1989)
[Publications] S.Kagoshima: "2K-Superconducting State with less Disorder in the Organic Superconductor β-(BEDT-TTF)_2I_3" Solid State Commun.71. 843-846 (1989)
[Publications] K.Ikegami: "Anomalous Linewidth of Electron Spin Resonance in Langmuir-Blodgett Films of the 3:2 Complex of Tetramethyltetrathiafulvalene and Tetradecyltetracyanoquinodimethane" Thin Solid Films. 179. 177-182 (1989)
[Publications] P.Wang: "Crystal Structures and Electrical Properties of Tetrakis(methylseleno)tetrathiafulvalene(TSeC_1-TTF)and Two Phases of(TSeC_1-TTF)I_3" Bull.Chem.Soc.Jpn.62. 2252-2257 (1989)
[Publications] P.Wang: "Thermal and Electrical Properties of Tetrakis(alkylseleno)tetrathiafulvalenes(TSeC_n-TTF,n=1-18)" J.Phys.Chem.93. 5947-5052 (1989)

1989 Fiscal Year Annual Research Report

高温有機超伝導体の開発

Principal Investigator

池本 勲 東京都立大学, 理学部, 教授 (00011601)

Research Products

[Publications] Y.Ishikawa: "Structure of the Organic Superconductor(DMET)_2AuI_2" Acta Crystallogr.C45. 572-575 (1989)

[Publications] K.Kanoda: "Anomalous Spin Dynamics of Conduction Electrons in the Organic Conductor,[dimethyl(ethylenedithio)diselenadithiafulvalene]_2AuBr_2[(DMET)_2AuBr_2]" Solid State Commun.68. 415-418 (1989)

[Publications] K.Kanoda: "EPR Studies of a New Family of Organic Conductors:The dimethyl(ethylenedithio)-diselenadithiafulvalene compounds(DMET)_2X[X=PF_6,BF_4,Au(CN)_2,I_3 and AuBr_2]" Phys.Rev.B39. 3996-4003 (1989)

[Publications] K.Saito: "Phase Transition of(DMET)_2Au(CN)_2 at 180K" J.Phys.:Condensed Matt.1. 8823-8829 (1989)

[Publications] K.Saito: "First Unsymmetrical Donor Which Gives Organic Superconductors:DMET" Acta Crystallogr.C45. 1403-1405 (1989)

[Publications] K.Saito: "Thermoelectric Power and Order-Parameter Associated with the Phase Transition at 180K of the Organic Metal,(DMET)_2Au(CN)_2" J.Phys.Soc Jpn.58. 4093-4097 (1989)

[Publications] Y.Honda: "Phase Diagram of Superconductivity and Spin Density Wave in(DMET)_2Au(CN)_2" Solid State Commun.71. 1087-1092 (1989)

[Publications] M.Oshima: "Crystal Structures and Electrical Properties of BEDT-TTF Salts of Mercury(II)Thiocyanate with and without K Ion" Chem.Lett.1989. 1159-1162 (1989)

[Publications] Y.Iwasa: "Intrinsic Negative-Resistance Effect in Mixed-Stack Charge-Transfer Crystals" Phys.Rev.B. 39. 10441-10444 (1989)

[Publications] Y.Iwasa: "Switching Effect in Organic Charge Transfer Complex Crystals" Appl.Phys.Lett.55. 2111-2113 (1989)

[Publications] Y.Tokura: "Domain-wall Dynamics in Organic Charge-Transfer Compounds with One-dimensional Ferroelectricity" Phys.Rev.Lett.63. 2045-2408 (1989)

[Publications] T.Osada: "Non-Ohmic Conduction in the Magnetic Field Induced Spin Density Wave State" Synth.Metals. 29. F305-F312 (1989)

[Publications] S.Kagoshima: "A Change of the Superstructure and an Associated Rise of the Superconducting Critical Temperature in the Organic Superconductor βー(BEDT-TTF)_2I_3" Solid State Commun.69. 1177-1180 (1989)

[Publications] G.Saito: "Chemical and Physical Properties of Organic Superconductor κー(BEDT-TTF)_2Cu(NCS)_2" Advances in Superconductivity Kitazawa-Ishiguro Eds.Springer-Verlag. 107-112 (1989)

[Publications] H.Urayama: "Organic Metals and Superconductors Based on BEDT-TTF" Advances in Superconductivity Kitazawa-Ishiguro Eds.Springer-Verlag. 113-118 (1989)

[Publications] K.Kanoda: "Complex Susceptibility and Penetration Depth of the Organic Superconductor,(BEDT-TTF)_2Cu(NCS)_2" Physica. C162ー164. 405-406 (1989)

[Publications] G.Saito: "An Overview of an Organic Superconductor:κー(BEDT-TTF)_2Cu(NCS)_2" Physica. C162ー164. 577-582 (1989)

[Publications] S.Kagoshima: "2K-Superconducting State with less Disorder in the Organic Superconductor β-(BEDT-TTF)_2I_3" Solid State Commun.71. 843-846 (1989)

[Publications] K.Ikegami: "Anomalous Linewidth of Electron Spin Resonance in Langmuir-Blodgett Films of the 3:2 Complex of Tetramethyltetrathiafulvalene and Tetradecyltetracyanoquinodimethane" Thin Solid Films. 179. 177-182 (1989)

[Publications] P.Wang: "Crystal Structures and Electrical Properties of Tetrakis(methylseleno)tetrathiafulvalene(TSeC_1-TTF)and Two Phases of(TSeC_1-TTF)I_3" Bull.Chem.Soc.Jpn.62. 2252-2257 (1989)

[Publications] P.Wang: "Thermal and Electrical Properties of Tetrakis(alkylseleno)tetrathiafulvalenes(TSeC_n-TTF,n=1-18)" J.Phys.Chem.93. 5947-5052 (1989)

池本勲東京都立大学, 理学部, 教授 (00011601)