文章基本信息

标题：Superconductivity in Strong Spin Orbital Coupling Compound Sb₂Se₃
本地全文：下载
作者：P. P. Kong ; F. Sun ; L. Y. Xing 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2014
卷号：4
DOI：10.1038/srep06679
出版社：Springer Nature
摘要：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 ( T_C ) 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 T_C slop as the function of high pressure in conjunction with the evolutions of structural parameters at high pressures.