Temperature dependence of lattice parameters of α-(BEDT-TTF)2MHg(XCN)4 (M=K, Rb, NH4, and X=S, Se)

S. Endo, Y. Watanabe, T. Sasaki, T. Fukase, Naoki Toyota

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

The temperature dependence oflattice parameters in an isostructural series of α-(BEDT-TTF)2MHg(XCN)4(M=K, Rb, NH4: 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 NH4Hg(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
Volume86
Issue number1-3
DOIs
Publication statusPublished - 1997 Feb 28

Keywords

  • Diffraction and scattering
  • Organic conductors based on radical cation and/or anion salts
  • Organic superconductors
  • X-ray emission

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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