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  • Title: Superconductivity in Bi2-xSbxTe3-ySey(x= 1.0 andy= 2.0) under pressure.
    Author: He T, Yang X, Taguchi T, Zhi L, Miyazaki T, Kobayashi K, Akimitsu J, Ishii H, Liao YF, Goto H, Eguchi R, Kubozono Y.
    Journal: J Phys Condens Matter; 2020 Aug 20; 32(46):. PubMed ID: 32731210.
    Abstract:
    The crystal structure of BiSbTeSe2(Bi2-xSbxTe3-ySey(x= 1.0 andy= 2.0)) at 0-29 GPa is investigated through synchrotron x-ray diffraction (XRD) and two structural phase transitions are discovered. The stoichiometry of BiSbTeSe2employed in this study is Bi1.19(4)Sb0.81(4)Te0.83(4)Se2.17(4), as determined from energy-dispersive x-ray spectroscopy. The sample demonstrated structural transitions, from a rhombohedral structure (space group no 166,R3¯m) (phase I) to a monoclinic structure (space group no 12,C2/m) (phase II), and from phase II to a 9/10-fold monoclinic structure (space group no 12,C2/m) (phase III). The temperature dependence of resistance (R-Tplot) exhibited a semiconducting behavior in a low pressure range and changed from semiconducting to metallic behavior with increasing pressure. Pressure-driven superconductivity is observed above 9.1 GPa in Bi1.19(4)Sb0.81(4)Te0.83(4)Se2.17(4). The pressure phase corresponds to phase II. The superconducting transition temperature,Tc, increased with pressure. The maximumTcvalue is 8.3 K at 19.1 GPa. The magnetic field dependence ofTcin phase II of Bi1.19(4)Sb0.81(4)Te0.83(4)Se2.17(4)is proceeded by ap-wave polar model, indicating topologically nontrivial superconductivity. In addition, the emergence of superconductivity and the change in superconducting behavior are closely associated with the structural transitions.
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