Fermi Surfaces and Crystal Structure of a New Organic Conductor α-(BEDT-TTF)2KHg(SeCN)4

Takahiko Sasaki, Hiroaki Ozawa, Hatsumi Mori, Shoji Tanaka, Tetsuo Fukase, Naoki Toyota

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

Abstract

We have synthesized a new organic conductor α(BEDT-TTF)2KHg(SeCN)4which is found to be isostructural with a family of α-(BEDT-TTF)2MHg(SCN)4 with M=K, Tl, Rb and NH4, where BEDT-TTF is bis(ethylenedithio)tetrathiafulvalene. In contrast to superconducting (M=NH4) or antiferromagnetic (M=K, Tl, Rb) salts, the title compound remains a normal metal in the same way as α-(BEDT-TTF)2TlHg(SeCN)4. The magnetoresistance and the Shubnikovde Haas (SdH) effect have been measured at temperatures down to 0.5K and magnetic fields up to 23T. The SdH frequency of 670T, the effective mass of 2.0m0, and the Dingle temperature of L.6K are obtained in fields perpendicular to the conductive a-c plane. The magnetic field direction dependence of the frequency shows that the observed Fermi surface has a cylindrical shape. The temperature and the field dependence of the SdH oscillation amplitude are well explained by the standard Lifshitz-Kosevich formulation, indicating that the effective mass is essentially constant up to 23T.

Original languageEnglish
Pages (from-to)213-220
Number of pages8
Journaljournal of the physical society of japan
Volume65
Issue number1
DOIs
Publication statusPublished - 1996

Keywords

  • Crystal structure
  • Fermi surface
  • Magnetoresistance
  • Organic conductor
  • Shubnikovde Haas effect
  • α-(BEDT-TTF)KHg(SeCN)

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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