Pressure evolution of electrical transport in the 3D topological insulator (Bi,Sb)2(Se,Te)3

[摘要] The group V-VI compounds - like Bi2Se3, Sb2Te3, or Bi2Te3- have been widely studied in recent years for their bulk topological properties. The high-Z members of this series form with the same crystal structure, and are therefore amenable to isostructural substitution studies. It is possible to tune the Bi-Sb and Te-Se ratios such that the material exhibits insulating behavior, thus providing an excellent platform for understanding how a topological insulator evolves with applied pressure. We report our observations of the pressure-dependent electrical transport and crystal structure of a pseudobinary (Bi,Sb)2(Te,Se)3compound. Similar to some of its sister compounds, the (Bi,Sb)2(Te,Se)3pseudobinary compound undergoes multiple, pressure-induced phase transformations that result in metallization, the onset of a close-packed crystal structure, and the development of distinct superconducting phases.

[发布机构] Condensed Matter and Materials Division, Lawrence Livermore National Laboratory, Livermore; CA; 94550, United States^1;NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg; MD; 20899, United States^2;Department of Physics, University of Alabama at Birmingham, Birmingham; AL; 35294, United States^3

[关键词] Electrical transport;Pressure dependent;Pressure evolution;Pressure-induced phase transformations;Pseudobinary compounds;Super conducting phasis;Topological insulators;Topological properties