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

International Conference on Strongly Correlated Electron Systems 2014

Jeffries, J.R.^1 ; Butch, N.P.^1,2 ; Vohra, Y.K.^3 ; Weir, S.T.^1

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;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/592/1/012124/pdf
DOI  :  10.1088/1742-6596/592/1/012124

来源: IOP

【 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.