Thermal-expansion studies on the low-T phase diagram of α-(BEDT-TTF)2KHg(SCN)4

M. Köppen, F. Kromer, M. Lang, F. Steglich, T. Sasaki, Naoki Toyota, H. Tajima

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

High-resolution thermal-expansion measurements on high-quality single crystals of the title compound reveal thermodynamic evidence for a second-order phase transition at TA = 7.9K. According to the Ehrenfest relation the negative signs of the discontinuities in the coefficient of thermal expansion for directions parallel and perpendicular to the conducting planes correspond to negative uniaxial-pressure dependences of TA with a predominant effect along the intralayer direction. At a temperature slightly above TA, i.e. around 12K, measurements perpendicular to the planes reveal indications for a second anomaly which is field-independent for B ≤ 9.5T but shows a peculiar dependence on the thermal history.

Original languageEnglish
Pages (from-to)2059-2060
Number of pages2
JournalSynthetic Metals
Volume86
Issue number1-3
Publication statusPublished - 1997 Feb 28

Keywords

  • BEDT-TTF salt
  • Spin-density-wave transition
  • Thermal expansion

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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    Köppen, M., Kromer, F., Lang, M., Steglich, F., Sasaki, T., Toyota, N., & Tajima, H. (1997). Thermal-expansion studies on the low-T phase diagram of α-(BEDT-TTF)2KHg(SCN)4. Synthetic Metals, 86(1-3), 2059-2060.