期刊
JOURNAL OF PHYSICS-CONDENSED MATTER
卷 32, 期 46, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1361-648X/abaad2
关键词
pressure-driven superconductivity; topological insulator; p-wave; crystal structure; electrical resistance
资金
- MEXT [17K05500, 18K04940, 18K18736, 19H02676]
- Grants-in-Aid for Scientific Research [17K05500, 18K18736, 18K04940, 19H02676] Funding Source: KAKEN
The crystal structure of BiSbTeSe2 (Bi2-xSbxTe3-ySey (x = 1.0 and y = 2.0)) at 0-29 GPa is investigated through synchrotron x-ray diffraction (XRD) and two structural phase transitions are discovered. The stoichiometry of BiSbTeSe2 employed in this study is Bi-1.19(4)Sb0.81(4)Te0.83(4) Se-2.17(4), as determined from energy-dispersive x-ray spectroscopy. The sample demonstrated structural transitions, from a rhombohedral structure (space group no 166, R (3) over barm) (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-T plot) 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) Se-2.17(4). The pressure phase corresponds to phase II. The superconducting transition temperature, T-c, increased with pressure. The maximum T-c value is 8.3 K at 19.1 GPa. The magnetic field dependence of T-c in phase II of Bi1.19(4)Sb0.81(4)Te0.83(4)Se2.17(4) is proceeded by a p-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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