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Title: Universal superconductivity phase diagram for pressurized tetradymite topological insulators

Journal Article · · Physical Review Materials
 [1]; ORCiD logo [2];  [1];  [3];  [1];  [1];  [1];  [1];  [1];  [1];  [4];  [4];  [1];  [1];  [5];  [6]
  1. Chinese Academy of Sciences (CAS), Beijing (China)
  2. Princeton Univ., NJ (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Russian Academy of Sciences, Moscow (Russia)
  4. Chinese Academy of Sciences (CAS), Shanghai (China)
  5. Princeton Univ., NJ (United States)
  6. Chinese Academy of Sciences (CAS), Beijing (China); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Two different superconducting phases exist at high pressures in the optimized tetradymite topological insulators Bi2Te2Se (BTS) and Bi1.1Sb0.9Te2S (BSTS) are demonstrated in this work. The superconducting phases emerge at structural phase transitions; the first at ~ 8.4 GPa for BTS and ~ 12.4 GPa for BSTS, and the second at 13.6 GPa for BTS and 20.4 GPa, for BSTS. Electronic structure calculations show that these phases do not have topological character. Comparison of our results with prior work on Bi2Se3, Bi2Te3, and (Bi, Sb)2(Se,Te)3 enable us to uncover a universal phase diagram for pressure-induced superconductivity in tetradymites, providing a basis for understanding the relationships between topological behavior, crystal structure, and superconductivity for these materials.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC). Basic Energy Sciences (BES) (SC-22); USDOE National Nuclear Security Administration (NNSA); National Key Research and Development Program of China; National Natural Science Foundation of China (NSFC)
Grant/Contract Number:
89233218CNA000001
OSTI ID:
1544747
Report Number(s):
LA-UR-19-26036; PRMHAR
Journal Information:
Physical Review Materials, Vol. 2, Issue 11; ISSN 2475-9953
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 8 works
Citation information provided by
Web of Science

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