Electrical conduction in divalent BEDT-TTF salts

H. Ito, Y. Yokochi, H. Tanaka, S. Kuroda, R. Kanehama, M. Umemiya, H. Miyasaka, K. I. Sugiura, M. Yamashita

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4 Citations (Scopus)


Transport and ESR measurements have been performed on organic semiconductors synthesized by the diffusion method. For (BEDT-TTF)Cu 2Br4, a pressure of 1 GPa raises the conductivity by up to one order of magnitude, but does not alter the semiconducting nature. By the ESR measurements, we find no Cu2+ signals, indicating that the BEDT-TTF molecules are divalent. The Hall carrier concentration increases exponentially with temperature, approaching the spin concentration evaluated by the low-temperature ESR from π-electrons. Thermopower measurements also support the contribution of the thermally activated electronic carriers. For (BEDTTTF)2Cu3Br7(H2O), the conductivity increases twice by applying a pressure of 0.8 GPa.

Original languageEnglish
Pages (from-to)441-444
Number of pages4
JournalSynthetic Metals
Issue number1-3
Publication statusPublished - 2005 Sept 21


  • Conductivity
  • Electron spin resonance
  • Hall effect
  • Organic conductors
  • Thermopower


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