Thermal transport property of NiTe2O5

Abstract

Recently, we have reported that quasi-one-dimensional S=1 chain system NiTe2O5[1]. In terms of the crystallographic structure, Ni2+ ions are located in the middle of each NiO6 octahedra, which is connected through the edge-sharing and forms a quasi-one-dimensional chain structure. As decreasing temperature, spin-1 of Ni2+ ions are ordered to the antiferromagnetic long-range order at 30.5 K. The single crystal neutron diffraction reveals the unconventional critical behavior of the order parameter around the ordering temperature and a 125Te nuclear magnetic resonance (NMR) experiments reveal the intriguing persistent spin fluctuation above the ordering temperature[2]. By using the thermal transport experiments on NiTe2O5 single crystal, we have studied thermodynamic properties associated with these unusual magnetic behaviors in NiTe2O5.

[1] Jun Han Lee, Marie Kratochvílová, Huibo Cao, Zahra Yamani, JS Kim, Je-Geun Park, GR Stewart, Yoon Seok Oh, Unconventional critical behavior in the quasi-one-dimensional S=1 chain NiTe2O5, Physical Review B 100, 144441 (2019). [2] Seung-Ho Baek, Jun Han Lee, Yoon Seok Oh, Kwang-Yong Choi, Bernd Büchner, Persistence of Ising-like easy-axis spin correlations in the paramagnetic state of the spin-1 chain compound NiTe2O5, Physical Review B 104, 214431 (2021).