Yang Xiaojun, Zhou Yonghui, Wang Mengmeng, Bai Hua, Chen Xuliang, An Chao, Zhou Ying, Chen Qian, Li Yupeng, Wang Zhen, Chen Jian, Cao Chao, Li Yuke, Zhou Yi, Yang Zhaorong, Xu Zhu-An
State Key Laboratory of Silicon Materials and Department of Physics, Zhejiang University, Hangzhou, 310027, China.
School of Physics and Optoelectronics, Xiangtan University, Xiangtan, 411105, China.
Sci Rep. 2018 Apr 19;8(1):6298. doi: 10.1038/s41598-018-24572-z.
Transition-metal chalcogenides host various phases of matter, such as charge-density wave (CDW), superconductors, and topological insulators or semimetals. Superconductivity and its competition with CDW in low-dimensional compounds have attracted much interest and stimulated considerable research. Here we report pressure induced superconductivity in a strong spin-orbit (SO) coupled quasi-one-dimensional (1D) transition-metal chalcogenide NbTe, which is a CDW material under ambient pressure. With increasing pressure, the CDW transition temperature is gradually suppressed, and superconducting transition, which is fingerprinted by a steep resistivity drop, emerges at pressures above 12.4 GPa. Under pressure p = 69 GPa, zero resistance is detected with a transition temperature T = 2.2 K and an upper critical field μH = 2 T. We also find large magnetoresistance (MR) up to 102% at low temperatures, which is a distinct feature differentiating NbTe from other conventional CDW materials.
过渡金属硫族化合物包含多种物相，如电荷密度波（CDW）、超导体以及拓扑绝缘体或半金属。低维化合物中的超导性及其与CDW的竞争引起了人们的广泛关注，并激发了大量研究。在此，我们报道了在强自旋轨道（SO）耦合的准一维（1D）过渡金属硫族化合物NbTe中由压力诱导的超导性，该化合物在常压下是一种CDW材料。随着压力增加，CDW转变温度逐渐被抑制，而在高于12.4 GPa的压力下出现了以陡峭电阻下降为特征的超导转变。在压力p = 69 GPa下，检测到零电阻，转变温度T = 2.2 K，上临界场μH = 2 T。我们还发现在低温下高达102%的大磁电阻（MR），这是将NbTe与其他传统CDW材料区分开来的一个显著特征。
