Thermal transport experiment on the quasi-one-dimensional spin chain NiTe2O5

Abstract

The thermal transport experiment is a unique method used to measure the transport properties of itinerant quasiparticles, both for charge-neutral as well as charged systems. It is known that one-dimensional magnetism prohibits long-range order but can lead to interesting bosonic and fermionic magnetic excitation. Recently, we reported a new quasi-one-dimensional spin chain NiTe2O5[1]. As decreasing temperature, archetypal antiferromagnetic phase transition happens across 30.5 K with an unconventional critical exponent of the order parameter. Beyond the ordering temperature, short-range spin correlation surprisingly survives up to room temperature[2]. In addition, it has been reported that the p-d hybridization induced magnetoelastic coupling and yields the high-order magneto-dielectric effect[3]. Thus, NiTe2O5 has an intriguing correlation for spin degree of freedom. In order to investigate a hindered magnetic excitation in NiTe2O5, we have developed the thermal transport experiment system for a relatively small specimen and studied thermal properties in NiTe2O5. In this presentation, we introduce our experiment setup and discuss the preliminary experimental results.

[1] J. H. Lee et al., Physical Review B 100, 144441 (2019). [2] S-H Baek et al., Physical Review B 104, 214431 (2021). [3] A. Tiwari et al., Physical Review Materials 6, 044409 (2022).