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

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

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
Volume153
Issue number1-3
DOIs
Publication statusPublished - 2005 Sep 21

Keywords

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

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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  • Cite this

    Ito, H., Yokochi, Y., Tanaka, H., Kuroda, S., Kanehama, R., Umemiya, M., Miyasaka, H., Sugiura, K. I., & Yamashita, M. (2005). Electrical conduction in divalent BEDT-TTF salts. Synthetic Metals, 153(1-3), 441-444. https://doi.org/10.1016/j.synthmet.2005.07.326