ac Calorimetry and EPR Study on Metal–Insulator Transition and Glass Transition in an Organic Conductor with Double-Column Structure, (DIMET)<sub>2</sub>BF<sub>4</sub><sup>*</sup>

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  • Saito Kazuya
    Research Center for Molecular Thermodynamics, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043
  • Akutsu Hiroki
    Research Center for Molecular Thermodynamics, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043
  • Kikuchi Koichi
    Department of Chemistry, Graduate School of Science, Tokyo Metropolitan University, Hachioji, Tokyo 192-0364
  • Nishikawa Hiroyuki
    Department of Chemistry, Graduate School of Science, Tokyo Metropolitan University, Hachioji, Tokyo 192-0364
  • Ikemoto Isao
    Department of Chemistry, Graduate School of Science, Tokyo Metropolitan University, Hachioji, Tokyo 192-0364
  • Sorai Michio
    Research Center for Molecular Thermodynamics, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043

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  • ac Calorimetry and EPR Study on Metal-Insulator Transition and Glass Transition in an Organic Conductor with Double-Column Structure, (DIMET)2BF4.

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Successive metal-insulator transitions in (DIMET)2BF4 were studied by chopped-light ac calorimetry and electron paramagnetic resonance (EPR) measurement. An anomaly due to the metal-insulator transitions has been clearly detected in ac calorimetry between 20 and 35 K. In contrast to other double-column salts (DMET)2BF4 and (DMET)2ClO4, successive metal-insulator transitions detected in transport properties are shown to be thermodynamic phase transitions. The EPR detected an anomaly only for the lowest transition around 12 K. The properties of the metal-insulator transitions are compared among the DIMET and DMET salts having the double-column structure. A frequency-dependent step in heat capacity was detected around 110 K. The step-like anomaly is attributed to a glass transition due to freezing of the intramolecular motion of the ethylene group in the ET moiety within a DIMET molecule.

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