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Sci Rep. 2018 Apr 19;8(1):6298. doi: 10.1038/s41598-018-24572-z.

Pressure induced superconductivity bordering a charge-density-wave state in NbTe4 with strong spin-orbit coupling.

Yang X1,2, Zhou Y3, Wang M1, Bai H1, Chen X3, An C3, Zhou Y3, Chen Q1, Li Y1, Wang Z1, Chen J1, Cao C4, Li Y4, Zhou Y1,5, Yang Z6,7, Xu ZA8,9,10.

Author information

1
State Key Laboratory of Silicon Materials and Department of Physics, Zhejiang University, Hangzhou, 310027, China.
2
School of Physics and Optoelectronics, Xiangtan University, Xiangtan, 411105, China.
3
Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, Chinese Academy of Science, Hefei, 230031, China.
4
Department of Physics, Hangzhou Normal University, Hangzhou, 310036, China.
5
Collaborative Innovation Centre of Advanced Microstructures, Nanjing, 210093, P. R. China.
6
Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, Chinese Academy of Science, Hefei, 230031, China. zryang@issp.ac.cn.
7
Collaborative Innovation Centre of Advanced Microstructures, Nanjing, 210093, P. R. China. zryang@issp.ac.cn.
8
State Key Laboratory of Silicon Materials and Department of Physics, Zhejiang University, Hangzhou, 310027, China. zhuan@zju.edu.cn.
9
Zhejiang California International NanoSystems Institute, Zhejiang University, Hangzhou, 310058, China. zhuan@zju.edu.cn.
10
Collaborative Innovation Centre of Advanced Microstructures, Nanjing, 210093, P. R. China. zhuan@zju.edu.cn.

Abstract

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 NbTe4, 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 c  = 2.2 K and an upper critical field μ0Hc2 = 2 T. We also find large magnetoresistance (MR) up to 102% at low temperatures, which is a distinct feature differentiating NbTe4 from other conventional CDW materials.

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