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PRESSURE CONTROL OF ORGANIC CONDUCTOR-DISCOVERY OF NEW TYPE OF NARROW GAP SEMICONDUCTORS

Research Project

Project/Area Number 10304031
Research Category

Grant-in-Aid for Scientific Research (A).

Allocation TypeSingle-year Grants
Section一般
Research Field 固体物性Ⅱ(磁性・金属・低温)
Research InstitutionTOHO UNIVERSITY

Principal Investigator

KAJITA Koji  TOHO UNIVERSITY, FACUILTY OF SCIENCE, PROFESSOR, 理学部, 教授 (50011739)

Co-Investigator(Kenkyū-buntansha) TAMURA Masahumi  THE INSTITUTE OF PHYSICAL AND CHEMICAL RESEARCH, SENIOR RESEARCHER, 先任研究員 (00231423)
NISHIO Yutaka  TOHO UNIV., FACULTY OF SCIENCE, ASSOCIATED PROFESSOR, 理学部, 助教授 (20172629)
Project Period (FY) 1998 – 2000
Project Status Completed (Fiscal Year 2000)
Budget Amount *help
¥6,400,000 (Direct Cost: ¥6,400,000)
Fiscal Year 2000: ¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1999: ¥4,200,000 (Direct Cost: ¥4,200,000)
KeywordsORGANIC CONDUCTOR / MAGNETO-TRANSPORT / HALLEFFECT / NARROW GAP SEMICONDUCTOR / PRESSURE EFFECT / UNIAXIAL STRAIN / ナローギャップ半導体
Research Abstract

Many organic conductors exhibit temperature-independent conductivity. Usually, they are considered to be dirty metals of which the electrical conduction is governed by impurity scattering. One of the main results of this investigation is the finding of pure organic conductors which shows temperature independent conductivity. In those conductors, both carrier density and mobility vary strongly with temperature. Nevertheless, we see temperature independent conduction because the effect of the change in the density and mobility just cancel out. Up to now, we know no other materials with such curious character both among organic and inorganic conductors. According to the density change at low temperatures, we found that they are semiconductors with extremely narrow energy gap.
Organic conductors such as α-(BEDT-TTF)_2I_3, α-(BEDT-TSeF)_2I_3, O-(BEDT-TTF)_2I_3 and α-(BEDT-STF)_2I_3 belongs to this category of materials in case they are placed under high pressures.
Another characteristic behavior of those materials is observed at low temperature under magnetic field. The property of carriers varies with increasing field. There are three steps of change. At low field limit, carriers have the mass of about 0.02m. where m is the free electron mass. In the intermediate field, the mass rises to a value close to m. In the high fields such as 10T, carrier mass looks to be much heavier.

Report

(4 results)
  • 2000 Annual Research Report   Final Research Report Summary
  • 1999 Annual Research Report
  • 1998 Annual Research Report
  • Research Products

    (40 results)

All Other

All Publications (40 results)

  • [Publications] 森初果: "New Organic Conduction Containing Mapretic I on of Cu (II) α^n-(BEDT-TTF)_2Cu(SCN)_4"Chemistry Letters. 505-506 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 梶田晃示: "an ulthe Narrow gap Organic Semiconduction in the Magnetic Field"Proc.4th Int.Symprosium on aduanced Physical Field. 79-81 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 田嶋尚也: "anomalous Magnetic transfors of a Highly Medical Electron Sptem in α-(BEDT-TTF)_2I_3"Synthetic Metals. 103. 1960-1960 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 田嶋尚也: "Finding of a New Organic Semiconductor with an Extremely Narow Gap"Synthetie Metals. 103. 1958-1959 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 西尾豊: "Specific Heat and Metal-Ineulator Transition of (BEDT-TTF)_2MZ_n(SCN)_4(M=Cs,Rb)"Synthetic Metals. 103. 1907-1908 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 大島勇吾: "Cyclotron Reseonance Study of θ-(BEDT-TTF)_2I_3"Synthetic Metals. 103. 1919-1920 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 塩見大輔: "Possible super-high-spin cluster in the anptal of a Nauel Nitroxide Radicals as Studied by FT Palsied ESR"Mol.Cupt.and Liq.Cryst.. 335. 359-369 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 田嶋尚也: "Transport Property of an Organic Conductor α-(BEDT-TTF)_2I_3 under High Pressure-Discovery of a Novel type-"J.Phys.Sac.Jpn.. 69. 543-551 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 森初果: "Uiscontinaous Change of metal-Insulator Transition of the alluyed θ-System : θ-(BEDT-TTF)_2(C_<xy>Rb_<1-x>)Zn(SCN)_4"J.Phys.Sac.Jpn.. 69. 1751-1756 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 西尾豊: "Thermal study of (DME-DCNQI)_2Cu System-Mechanism of Reentrant Metal-insulator Transition"J.Phys.Sca.Jpn.. 69. 1414-1422 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 森初果: "Bandwidth and Band Fidling Contral in Organic Conductars"Synthetic Metals. (印刷中).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 西尾豊: "Anomalons Specific Heart of (DEe-DCNQI-d_2[1,1;0]_<1-x>d_4[2,2;0])_2Cu-System"Synthetic Metals. (印刷中).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 笠原茂: "Hynamical Behavious of Vartices in a Layord Supereonductor-K-(BEDT-TTF)_2Ca(NCS)_2"Synthetic Metals. (印刷中).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 田嶋尚也: "Transport property of α-(BEDT-TTF)_2I_3 under high Pressure-Ultra Narrow Gap Semiconductor-"Synthetic Metals. (印刷中).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 西尾豊: "DCNQI系リエントラント金属-絶縁体の熱的研究"熱測定. 25. 154-161 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] M.Mori: "New Organic Conductor containing Magnetic Ion of Cu(II) ; α"-(BEDT-TTF)_2KCu(SCN)_4"Chemistry Letters. 505-506 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] K.Kajita: "An Ultra Narrow gap Organic Semiconductor in the Magnetic field."Proc.4th Int.symposium on advanced physical field. 79-81 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] N.Tajima: "Anomalous Magnetotransport of a Highly Mobile electron system in α-(BEDT-TTF)_2I_3"Synhtetic Metals. 103. 1960 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] N.Tajima: "Finding of a New Organic Semiconductor with an Extremely Narrow Gap"Synthetic Metals. 103. 1958-1959 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Y.Nishio: "Specific Heat and Metal-Insulator Transition of (BEDT-TTF)_2MZn(SCN)_4 (M=Cs, Rb)"Synthetic Metals. 103. 1907-1908 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Y.Oshima: "Cyclotron resonance study of θ-(BEDT-TTF)_2I_3"Synthetic Metals. 103. 1919-1920 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] D.Shiomi: "Possible superhigh-Spin Cluster in the Crystal of a Novel Nitronyl Nitroxide Radical as studied by FT Pulsed ESR"Mol.Cryst. and Liq.Cryst. 335. 359-369 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] N.Tajima: "Transport Property of an Organic Conductor α-(BEDT-TTF)_2I_3 under High Pressure-Discovery of a Novel type of Conductor-"J.Phys.Soc.Jpn.. 69. 543-551 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] H.Mori: "Discontinuous Change of Metal-Insulator Transition of the Alloyed θ-System : θ-(BEDT-TTF)_2(Cs_xRb_<1-x>)Zn(SCN)_4"J.Phys.Soc.Jpn.. 69. 1751-1756 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Y.Nishio: "Thermal Study of (DMe-DCNQI)_2Cu system-Mechanism of Reentrant Metal-Insulator Transition-."J.Phys soc.Jpn.. 69. 1414-1422 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] H.Mori: "Bandwidth and band filling control in Organic conductors"Syntnetic Metals. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Y.Nishio: "Anomalous specific heat of (DMe-DCNQI-d_2 [1,1 ; 0] _<1-x>d_4 [2,2 ; 0] _x)_2Cu-system"Synthetic Metals. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] S.Kasahata: "Dynamical behavior of vortices in a layered superconductor κ-(BEDT-TTF)_2Cu(NCS)_2"Synthetic Metals. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] N.Tajima: "Transport property of α-(BEDT TTF)_2I_3 under high pressure ultra narrow gap semiconductor"Synthetic Metal. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] M.Tamura: "π-f composite metals"Synthetic Metals. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Y.Nishio: "Thermomechanical Study of Metal-Insulator Transition of DCNQI-System (in Japanese)"Netusokutei. 25. 154-1161 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 森初果: "Discontinuous Change of Metal-Insuulator Transstion of the Collaged θ-System : θ-(BEDT-TTF)_2(C_<sx>Rb_<l-x>)Z_n(SCN)_4"J.Phys.Sac.Jpn. 69. 1751-1756 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 西尾豊: "Thermal Study of (DMe-DCNQI)_2C_u System-Mechanism of Reentrant Metal-Insulator Transition"J.Phys.Sac.Jpn.. 69. 1414-1422 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 森初果: "Band width and Band Filling Control in Organic Conductors"Synthetic Metals. (印刷中).

    • Related Report
      2000 Annual Research Report
  • [Publications] 西尾豊: "anomalous Specific heat of (DMe-DCNAI-d_2[1,1;0]_<l-x>d_4[2,2;0]_x)_2C_u-System"Synthelic Metals. (印刷中).

    • Related Report
      2000 Annual Research Report
  • [Publications] 笠原茂: "Dynamical Behavior of Vortices in a Layard Superconductor k-(BEDT-TTF)_1 C_u(NCS)_2"Synthetic Metals. (印刷中).

    • Related Report
      2000 Annual Research Report
  • [Publications] 田嶋尚也: "Transport Properties of α-(BEDT-TTF)_2I_3 Under High Pressure-Ultra Narrow gap semiconductor"Synthetic Metals. (印刷中).

    • Related Report
      2000 Annual Research Report
  • [Publications] 田村雅史: "π-f Composite Metals"Synthetic Metals. (印刷中).

    • Related Report
      2000 Annual Research Report
  • [Publications] 田嶋尚也,田村雅史,西尾豊,梶田晃示,家奈弘: "Transport Property of an Organic Conductor α-(BEDT-TTF)_2I_3 under high Pressure -Discovery of a novel type of Conductor-"Journal of the Physical Society of Japan. 69・2. 543-551 (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] 西尾豊,田村雅史,梶田晃示,青沼,沢,加藤,小林: "Thermodynamical study of (Dme-DCNQI)_2Cu system -Mechanism of Reentrent Metal-Insulator Transition"Journal of the Physical Society of Japan. (印刷中)69・5. (2000)

    • Related Report
      1999 Annual Research Report

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Published: 1999-04-01   Modified: 2020-05-15  

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