WM Li

Kunming Medical University

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C. Q. Jin

Xinjiang University

Fei Sun

Chinese Academy of Sciences

Lei Xing

Stanford University

P. P. Kong

Max Planck Institute for Chemistry

Yong Liu

Xuzhou Medical College

Y. J. Long

Institute of Physics

GF Chen

Institute of Physics

Ho‐kwang Mao

Center for High Pressure Science and Technology Advanced Research

Jun Zhu

Chinese Academy of Sciences

Xiaohu Yu

Chinese Academy of Sciences

Cooperative Institutions

Chinese Academy of Sciences

Institute of Physics

University of Chinese Academy of Sciences

Czech Academy of Sciences, Institute of Physics

National Laboratory for Superconductivity

Geophysical Laboratory

Carnegie Institution for Science

Center for High Pressure Science and Technology Advanced Research

Center for High Pressure Science & Technology Advanced Research

Stanford University

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Superconductivity in Strong Spin Orbital Coupling Compound Sb2Se3

Scientific Reports (2014)

P. P. Kong Fei Sun Lei Xing Jun Zhu Sijie Zhang

Recently, A2B3 type strong spin orbital coupling compounds such as Bi2Te3, Bi2Se3 and Sb2Te3 were theoretically predicated to be topological insulators and demonstrated through experimental efforts. The counterpart compound Sb2Se3 on the other hand was found to be topological trivial, but further theoretical studies indicated that the pressure might induce Sb2Se3 into a topological nontrivial state. Here, we report on the discovery of superconductivity in Sb2Se3 single crystal induced via pressure. Our experiments indicated that Sb2Se3 became superconductive at high pressures above 10 GPa proceeded by a pressure induced insulator to metal like transition at ~3 GPa which should be related to the topological quantum transition. The superconducting transition temperature (TC) increased to around 8.0 K with pressure up to 40 GPa while it keeps ambient structure. High pressure Raman revealed that new modes appeared around 10 GPa and 20 GPa, respectively, which correspond to occurrence of superconductivity and to the change of TC slop as the function of high pressure in conjunction with the evolutions of structural parameters at high pressures.

Topological insulator

Ambient pressure

Superconducting transition temperature

10.1038/srep06679

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Superconductivity in HfTe5 across weak to strong topological insulator transition induced via pressures

Scientific Reports (2017)

Yong Liu Y. J. Long Li‐Juan Zhao Simin Nie Shaojian Zhang

Abstract Recently, theoretical studies show that layered HfTe 5 is at the boundary of weak & strong topological insulator (TI) and might crossover to a Dirac semimetal state by changing lattice parameters. The topological properties of 3D stacked HfTe 5 are expected hence to be sensitive to pressures tuning. Here, we report pressure induced phase evolution in both electronic & crystal structures for HfTe 5 with a culmination of pressure induced superconductivity. Our experiments indicated that the temperature for anomaly resistance peak (Tp) due to Lifshitz transition decreases first before climbs up to a maximum with pressure while the Tp minimum corresponds to the transition from a weak TI to strong TI. The HfTe 5 crystal becomes superconductive above ~5.5 GPa where the Tp reaches maximum. The highest superconducting transition temperature (Tc) around 5 K was achieved at 20 GPa. Crystal structure studies indicate that HfTe 5 transforms from a Cmcm phase across a monoclinic C2/m phase then to a P-1 phase with increasing pressure. Based on transport, structure studies a comprehensive phase diagram of HfTe 5 is constructed as function of pressure. The work provides valuable experimental insights into the evolution on how to proceed from a weak TI precursor across a strong TI to superconductors.

Monoclinic crystal system

Topological insulator

Ambient pressure

Phase boundary

Crystal (programming language)

10.1038/srep44367

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Citations (28)