Shubnikov-de Haas oscillations in the two-dimensional organic conductor τ-(EDO-S,S-DMEDT-TTF)2(AuBr2)1+y (y∼0.75)

Takako Konoike, K. Iwashita, H. Yoshino, Keizo Murata, Takahiko Sasaki, G. C. Papavassiliou

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Abstract

The quasi-two-dimensional organic τ-type conductor. τ(EDO-S,S-DMEDT-TTF)2(AuBr21+y(y ∼0.75), shows metallic temperature dependence of the resistivity down to Tmin ∼50 K, below which resistance upturn is observed. There has been no evidence of the phase transition Tmin. In this work, in pursuit of direct evidence of metal at low temperature by transport measurement, we show an observation of the Shubnikov-de Haas (SdH) oscillations for this salt. The observed frequencies of the oscillations are inconsistent with the previous band calculation. Further, it is remarkable that the amplitude of the osclillation was so giant (|Δρ/ρ0|∼30%), and the oscillation above 20 T correqponds to a N = 2 Landau state, i.e., next to a quantum limit. We also observed the SdH oscillations in other τ-type conductor, τ-(P-S,S-DMEDT-TTF)2(AuBr2)1+y (y∼0.75) which almost reproduced the previous report by Storr et al. [Phys. Rev. B 64, 045107 (2001)].

Original languageEnglish
Article number245308
Pages (from-to)2453081-2453085
Number of pages5
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume66
Issue number24
Publication statusPublished - 2002 Dec 15

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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