Temperature dependence of lattice parameters of α-(BEDT-TTF) 2 MHg(XCN) 4 (M = K, Rb, NH 4 , and X = S, Se)

S. Endo, Y. Watanabe, Takahiko Sasaki, T. Fukase, N. Toyota

Research output: Contribution to journalConference articlepeer-review


The temperature dependence of lattice parameters in an isostructural series of α-(BEDT-TTF) 2 MHg(XCN) 4 (M = K, Rb, NH 4 : X = S, Se) has been studied from room temperature down to 11K by four-circle X-Ray diffraction measurements on single crystals. Only the superconducting NH 4 Hg(SCN) 4 salt shows a significant increase in the anisotropy ratio of c/a from 0.985 to 0.975 in the temperature range of 200K-50K, while all the other salts exhibiting a normal metallic or antiferromagnetic spin-density-wave ground state have the ratio of 0.990-0.985 almost independent of temperature. This difference in the in-plane lattice contraction could induce a topological difference of the Fermi surface at low temperature, via differently modulated transfer integrals.

Original languageEnglish
Pages (from-to)2013-2014
Number of pages2
JournalSynthetic Metals
Issue number1 -3 pt 3
Publication statusPublished - 1997 Jan 1
Externally publishedYes
EventProceedings of the 1996 International Conference on Science and Technology of Synthetic Metals, ICSM'96. Part 3 (of 3) - Snowbird, UT, USA
Duration: 1996 Jul 281996 Aug 2

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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