Nontrivial electrical transport properties and phase transitions of Co1/3NbS2 at high pressures
Xiao-Miao Zhao1, Zhen-Yu Li2, Qiu-Jun Hu2
1School of Materials Science and Engineering, Henan University of Technology, Zhengzhou, Henan 450001, China; State Key Laboratory for High Performance Tools, Zhengzhou Research Institute for Abrasives & Grinding Co., Ltd., Zhengzhou 450001, China.
Abstract:
Single -crystal Co1/3NbS2 was successfully synthesized under high-pressure and high-temperature conditions and was systematically characterized via structural, component, and magnetic measurements. Magnetization measurements revealed a paramagnetic to antiferromagnetic (PM-AFM) phase transition at 28.4 K. Electrical conductivity, Raman spectroscopy and X-ray diffraction measurements were performed on Co1/3NbS2 at high pressures (up to 46.1 GPa). We observed an anomaly (an inflection) in the temperature dependence of the resistivity at 4.4 GPa, and the inflection point shifted towards higher temperatures with increasing pressure. The abnormal resistivity above 2.1 GPa was closely related to the complete suppression of magnetic order. The electrical resistivity tended to change with increasing pressure at 9.0 and 15.0 GPa. The spectroscopic and crystallographic results demonstrated a redshift in the v1' and v2 peaks, indicating a potential topological phase transition at approximately 9.7 GPa. Moreover, an isostructural phase transition occurred in the material at 15.3 GPa, accompanied by the splitting of several Raman peaks. Above 23.1 GPa, the Raman spectrum exhibited an abrupt change, which was associated with a pressure-induced volume change in the material.
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