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, N. Toyota, H. Tajima

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


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
Issue number1-3
Publication statusPublished - 1997 Feb 28


  • 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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