Observation of the Thermal Conductivity due to Spins in the One-Dimensional Antiferromagnetic Ising-Like Spin System ACoX3 (A = Rb, Cs; X = Cl, Br)

TL;DR

This study reports the first observation of spin-related thermal conductivity in 1D antiferromagnetic Ising-like systems, revealing a small but distinct contribution from spin excitations in ACoX3 compounds.

Contribution

It provides the first experimental evidence of spin thermal conductivity in 1D AF Ising-like systems, expanding understanding of spin transport in low-dimensional magnets.

Findings

Observation of a shoulder in thermal conductivity around 60 K due to spin excitations.

Spin thermal conductivity in ACoX3 is smaller than in 1D AF Heisenberg systems.

Discussion of the Heisenberg-like character influencing spin thermal transport.

Abstract

Thermal conductivity measurements have been carried out for single crystals of the onedimensional (1D) antiferromagnetic (AF) Ising-like spin system ACoX3 (A = Rb, Cs; X = Cl, Br). A shoulder originating from the thermal conductivity due to spin excitations, \k{appa}?spin, has been observed around 60 K in the temperature dependence of the thermal conductivity along the c-axis parallel to spin chains for every ACoX3. To our knowledge, this is the first observation of ?\k{appa}spin in 1D AF Ising-like spin systems. It has been found that the magnitude of ?\k{appa}spin in ACoX3 is a little smaller than those in 1D AF Heisenberg spin systems. The reason is discussed in terms of the Heisenberg-like character in ACoX3.