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Keywords:

  • insulators;
  • magnetostriction;
  • phase transitions;
  • phonon scattering;
  • thermal conductivity

Abstract

The thermal conductivity of CsMnCl3 · 2H2O (CMC) – a quasi-one-dimensional antiferromagnet with spin 5/2 has been studied in the temperature range from 2 to 25 K in zero magnetic field. The analysis of the data performed within Debye model revealed the combined effect of the single-ion and volume magnetostriction in the vicinity of a phase transition. Thermal-conductivity calculations based on the model and corresponding experimental studies showed that the poor sample quality and small dimensions can suppress the manifestation of a spin–phonon coupling present in CMC.