Thermal Conductivity of the S = 1/2 Quasi-One-Dimensional Ferromagnetic Spin System CsCuCl3

TL;DR

This study measures thermal conductivity along the spin-chains of CsCuCl3 to understand spin contributions and how magnetic fields influence thermal transport in a quasi-one-dimensional ferromagnetic system.

Contribution

It provides experimental data on thermal conductivity in CsCuCl3 under magnetic fields, revealing the absence of spin contributions and the impact of magnetic field-induced spin state changes.

Findings

No spin contribution to thermal conductivity observed.

Thermal conductivity shows a dip at the antiferromagnetic transition temperature.

Thermal conductivity varies with magnetic field, reflecting spin state changes.

Abstract

We have measured the thermal conductivity along the c-axis, \k{appa}||c, parallel to ferromagnetic spin-chains of single crystals of the S = 1/2 quasi-one-dimensional spin system CsCuCl3 in magnetic fields up to 14 T, in order to investigate the thermal conductivity due to spins, \k{appa}spin, and the change of thermal conductivity corresponding to the change of the spin state. In the temperature dependence of \k{appa}||c, no contribution of \k{appa}spin has been observed, while a dip has been observed at the antiferromagnetic phase transition temperature, TN. Furthermore, it has been found that \k{appa}||c at a low temperature of 5.1 K below TN changes with increasing field perpendicular to the c-axis in good correspondence to the field-induced change of the spin state.