拓扑材料NbNiTe5中压力诱导的非晶化与超导性共存
Pressure-induced concurrent amorphization and superconductivity in topological material NbNiTe5
中文总结 AI 辅助
本研究系统探究高压下拓扑材料NbNiTe5的结构与电子性质，发现其约10 GPa时非晶化与超导性共存，超导性受结构无序度调控，Tc随压力升高缓慢上升，扩展了过渡金属硫族化物超导体家族。
中文摘要 AI 辅助
我们系统研究了拓扑材料NbNiTe5在高压下的结构与电子性质。正常态电阻从0.7 GPa到5.1 GPa呈现非单调变化，与X射线衍射和拉曼光谱观测到的层间二阶转变一致。约10 GPa时，样品开始发生非晶化，同时伴随超导性出现；进一步压缩时，结构无序度增强，超导转变更清晰，表明高压下NbNiTe5的超导性受无序度调控。在45.7 GPa范围内，超导转变温度Tc从9.5 GPa时的0.6 K缓慢升至45.7 GPa时的1.4 K。本研究扩展了过渡金属硫族化物超导体家族，为理解无序体系的超导性提供了新视角。
英文摘要
We have systematically studied the structural and electronic properties of a topological material NbNiTe5 under high pressure. The evolution of the normal state resistance shows a non-monotonic trend from 0.7 GPa to 5.1 GPa, in accordance with the second-order transition along the inter-layer direction observed in X-ray diffraction and Raman spectra. At around 10 GPa, the sample starts amorphization, which is concurrent with the emergence of superconductivity. Upon further compression, the structural disorder enhances and the superconducting transition becomes clearer, suggesting that the superconductivity is modulated by the degree of disorder in NbNiTe5 under high pressure. Within 45.7 GPa, the superconducting transition temperature (Tc) slowly rises from 0.6 K at 9.5 GPa to 1.4 K at 45.7 GPa. Our findings extend the family of transition metal chalcogenide superconductors and shed new light on understanding superconductivity in disordered systems.
