Metal-Semiconductor Transition of the New Organic Conductor (DTEDT)3Ag(CN)2.

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  • Kawamoto Tadashi
    Department of Organic and Polymeric Materials, Graduate School of Science and Engineering, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo 152-8552
  • Mori Takehiko
    Department of Organic and Polymeric Materials, Graduate School of Science and Engineering, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo 152-8552
  • Yamaura Jun-Ichi
    Institute for Solid State Physics, The University of Tokyo, Kashiwanoha, Kashiwa, Chiba 277-8581
  • Misaki Yohji
    Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Yoshida, Kyoto 606-01

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  • Metal–Semiconductor Transition of the New Organic Conductor (DTEDT)<sub>3</sub>Ag(CN)<sub>2</sub>

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Crystal structure analysis, transport properties, and ESR study of the new organic conductor (DTEDT)3Ag(CN)2, where DTEDT is 2-(1,3-dithiol-2-ylidene)-5-(2-ethanediylidene-1,3-dithiole)-1,3,4,6-tetrathiapentalene, have been carried out. The crystal structure and the energy band structure of the present compound are the same as (DTEDT)3Au(CN)2, which shows superconductivity around 4 K at ambient pressure, whereas the electrical resistivity of the Ag(CN)2 salt shows a metal–semiconductor transition at Tc = 40 K. The increase of the resistivity has been suppressed under a pressure of 10.3 kbar. The ESR spin susceptibility of this salt goes to zero below Tc without divergence of the linewidth. The ground state of (DTEDT)3Ag(CN)2 is a nonmagnetic semiconductor.

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