1988 Fiscal Year Final Research Report Summary
Electrical conductivity and dielectric constant of organic crystals in high frequency region
| Project/Area Number |
62470002
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
物理化学一般
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| Research Institution | Institute for Solid State Physics, University of Tokyo |
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Principal Investigator |
KINOSHITA Minoru ISSP, Univ. of Tokyo, 物性研究所, 教授 (40011530)
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| Co-Investigator(Kenkyū-buntansha) |
SUGANO Tadashi ISSP, Univ. of Tokyo, 物性研究所, 助手 (60134657)
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| Project Period (FY) |
1987 – 1988
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| Keywords | Organic Conductor / Organic Superconductor / Electrical Conductivity / BEDT-TTF / Cation Radical Salt / Microwave Conductivity Measurements |
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| Research Abstract |
1. The electrical conductivity of organic conductors based on bis(ethylenedithio)-tetrathiafulvalene(BEDT-TTF or ET) has been studied by conductivity measurements in the dc, ac, and optical regions.
(1) Several ET cation radical salts with the counter anion of AuI_2 are synthesized electrochemically and their electrical conductivities are measured. A new modification, exhibiting a metal-insulator transition, has been found.
(2) The (ET)_2 [Cu(NCS)_2] salt has been found to be an ambient-pressure organic superconductor, which has T = 10.4 K, the highest T so far found in organics.
(3) Prominent magnetic interaction between itinerant electron spins and localized electron spins has been found in the CoCl_4^<2-> and MuCl_4^<2-> salts of ET, at least the former being an organic conductor.
2. In addition, an apparatus for conductivity and dielectric constant measurements had been constructed using a reflection type microwave cavity, which facilitates the measurements without electrode contacts and in the temperature region of 4 - 300 K.
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