Evidence for a metallic but unusual ground state in τ-conductors

K. Murata, T. Konoike, K. Iwashita, H. Yoshino, T. Sasaki, K. Hiraki, T. Takahashi, Y. Nishio, K. Kajita, G. C. Papavassiliou

Research output: Contribution to journalConference articlepeer-review

2 Citations (Scopus)


The band calculation for the τ-conductors predicted the existence of a Fermi surface, which has a two-dimensional star-shaped 4-fold symmetry. Actually, both τ-(EDO-S,S-DMEDT-TTF)2(AuBr2)1+y and τ-(P-S,S-DMEDT-TTF)2(AuBr2)1+y (y ∼ 0.75) show metallic temperature dependence of resistivity (dR/dT > 0) below 300 K with a resistance upturn at 30-50 K. Below the temperature of resistance minimum, a large negative magnetoresistance (MR) suddenly appears in temperature, accompanied by a remarkable features such as the switching of the periodicity of the angular dependence of MR, large electronic specific heat coefficient γ (0.06 J/molK2). Lots of works have been devoted to clarify whether or not the low temperature electronic state is metal. Recently we could demonstrate a giant Shubnikov de Haas oscillation in both materials, which is a direct evidence for a metallic state. We note that the observed FSs were not consistent with the previous calculation. How this metallic state explains those remarkable features is still unsolved.

Original languageEnglish
Pages (from-to)103-105
Number of pages3
JournalSynthetic Metals
Publication statusPublished - 2003 Mar 13
EventISCOM 2001 - Rusutsu, Hokkaido, Japan
Duration: 2001 Sept 102001 Sept 14


  • Fermi surface
  • Magnetic properties
  • Negative magnetoresistance
  • Organic conductor
  • Shubnikov de Haas effect
  • Transport properties


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