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

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

Research output: Contribution to journalConference article

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 T A = 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 T A with a predominant effect along the intralayer direction. At a temperature slightly above T A , 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 pt 3
DOIs
Publication statusPublished - 1997 Jan 1
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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    Koeppen, 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) 2 KHg(SCN) 4 Synthetic Metals, 86(1 -3 pt 3), 2059-2060. https://doi.org/10.1016/S0379-6779(97)81026-0