λ-Type BETS salts containing a mixed halide gallium anion, GaXx Y4−x [X, Y = F, Cl, Br; BETS = Bis(ethylenedithio)tetraselenafulvalene]

Authors

  • Hisashi Tanaka,

    1. Department of Chemistry, School of Science The University of Tokyo Hongo 7-3-1, Bunkyo-ku, Tokyo 113 (Japan)
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  • Akiko Kobayashi,

    Corresponding author
    1. Department of Chemistry, School of Science The University of Tokyo Hongo 7-3-1, Bunkyo-ku, Tokyo 113 (Japan)
    • Department of Chemistry, School of Science The University of Tokyo Hongo 7-3-1, Bunkyo-ku, Tokyo 113 (Japan)
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  • Taro Saito,

    1. Department of Chemistry, School of Science The University of Tokyo Hongo 7-3-1, Bunkyo-ku, Tokyo 113 (Japan)
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  • Koichi Kawano,

    1. Department of Chemistry, Faculty of Science Toho University, Miyama 2-2-1, Funabashi Chiba 274 (Japan)
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  • Dr. Toshio Naito,

    1. Department of Chemistry, Faculty of Science Toho University, Miyama 2-2-1, Funabashi Chiba 274 (Japan)
    Current affiliation:
    1. Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo 060, Japan
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  • F. Hayao Kobayashi

    1. Institute for Molecular Science, Myodaiji-cho Okazaki, Aichi 444 (Japan)
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Abstract

A new series of organic superconductors is reported: λ-type salts of bis(ethylenedithio)tetraselenafulvalene (BETS) with mixed halide gallium anions. Their preparation and properties are described, with particular emphasis on the electrical resistivity. A strong correlation is observed between the superconducting transition temperature Tc and the unit cell volume, which should enable the superconducting transition to be investigated systematically and facilitate the design of new organic superconductors with enhanced Tc.

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