Positional Order and Disorder of Symmetric and Unsymmetric BEDT-STF Salts |
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| Authors: | H Mori H Suzuki T Okano H MoriyamaY Nishio K KajitaM Kodani K TakimiyaT Otsubo |
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| Institution: | a Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa Chiba, 277-8581, Japanb International Superconductivity Technology Center (ISTEC), Tokyo, 135-0062, Japanc Department of Chemistry, Faculty of Science, Toho University, Chiba, 274-8510, Japand Department of Physics, Faculty of Science, Toho University, Chiba, 274-8510, Japane Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima, 739-8527, Japan |
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| Abstract: | The symmetric (s-) and unsymmetric (us-) BEDT-STF (=bis(ethylenedithio)diselenadithia-fulvalene) salts were prepared, and their crystal structures and electrical resistivities were investigated. Four us-BEDT-STF salts have the positional disorder of the Se atoms in the STF framework in crystals, whereas three s-BEDT-STF salts have no disorder. When κ-(us-BEDT-STF)2GaCl4 and κ-(cis-s-BEDT-STF)2GaCl4 are compared, the latter without the positional disorder of the Se atoms is more conductive than the former one with the disorder. |
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