Superconductivity bordering Rashba type topological transition

Jin, M. L.; Sun, F.; Xing, L. Y.; Zhang, S. J.; Feng, S. M.; Kong, P. P.; Li, W. M.; Wang, X. C.; Zhu, J. L.; Long, Y. W.; Bai, H. Y.; Gu, C. Z.; Yu, R. C.; Yang, W. G.; Shen, G. Y.; Zhao, Y. S.; Mao, H. K.; Jin, C. Q.

doi:10.1038/srep39699

Title: Superconductivity bordering Rashba type topological transition

Journal Article · Wed Jan 04 00:00:00 EST 2017 · Scientific Reports

DOI:https://doi.org/10.1038/srep39699· OSTI ID:1346003

Jin, M. L. ^[1]; Sun, F. ^[2]; Xing, L. Y. ^[1]; Zhang, S. J. ^[1]; Feng, S. M. ^[1]; Kong, P. P. ^[1]; Li, W. M. ^[1]; Wang, X. C. ^[1]; Zhu, J. L. ^[3]; Long, Y. W. ^[1]; Bai, H. Y. ^[1]; Gu, C. Z. ^[1]; Yu, R. C. ^[1]; Yang, W. G. ^[4]; Shen, G. Y. ^[5]; Zhao, Y. S. ^[6]; Mao, H. K. ^[4]; Jin, C. Q. ^[7]

Chinese Academy of Sciences (CAS), Beijing (China)
Chinese Academy of Sciences (CAS), Beijing (China); Center for High Pressure Science & Technology Advanced Research (HPSTAR), Shanghai (China)
Univ. of Nevada, Las Vegas, NV (United States)
Carnegie Institution of Washington, Argonne, IL (United States); Center for High Pressure Science & Technology Advanced Research (HPSTAR), Shanghai (China)
Carnegie Institution of Washington, Argonne, IL (United States)
Chinese Academy of Sciences (CAS), Beijing (China); Univ. of Nevada, Las Vegas, NV (United States)
Chinese Academy of Sciences (CAS), Beijing (China); Collaborative Innovation Center of Quantum Matter, Beijing (China); Univ. of Chinese Academy of Sciences, Beijing (China)

Strong spin orbital interaction (SOI) can induce unique quantum phenomena such as topological insulators, the Rashba effect, or p-wave superconductivity. Combining these three quantum phenomena into a single compound has important scientific implications. Here we report experimental observations of consecutive quantum phase transitions from a Rashba type topological trivial phase to topological insulator state then further proceeding to superconductivity in a SOI compound BiTeI tuned via pressures. The electrical resistivity measurement with V shape change signals the transition from a Rashba type topological trivial to a topological insulator phase at 2 GPa, which is caused by an energy gap close then reopen with band inverse. Superconducting transition appears at 8 GPa with a critical temperature T_C of 5.3 K. Structure refinements indicate that the consecutive phase transitions are correlated to the changes in the Bi–Te bond and bond angle as function of pressures. As a result, the Hall Effect measurements reveal an intimate relationship between superconductivity and the unusual change in carrier density that points to possible unconventional superconductivity.

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Research Organization:: Carnegie Inst. of Science, Argonne, IL (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: NA0001974

OSTI ID:: 1346003

Journal Information:: Scientific Reports, Vol. 7; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 9 works

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