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Universal superconductivity phase diagram for pressurized tetradymite topological insulators

Author(s): Cai, Shu; Kushwaha, Satya Kumar; Guo, Jing; Sidorov, Vladimir A.; Le, Congcong; et al

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Abstract: © 2018 American Physical Society. We show that two different superconducting phases exist at high pressures in the optimized tetradymite topological insulators Bi2Te2Se (BTS) and Bi1.1Sb0.9Te2S (BSTS). The superconducting phases emerge at structural phase transitions; the first at ∼8.4GPa for BTS and ∼12.4GPa 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 allows 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.
Publication Date: Nov-2018
Electronic Publication Date: 13-Nov-2018
Citation: Cai, S., Kushwaha, S.K., Guo, J., Sidorov, V.A., Le, C., Zhou, Y., Wang, H., Lin, G., Li, X., Li, Y., Yang, K., Li, A., Wu, Q., Hu, J, Cava, Robert J., Sun, L. (2018). Universal superconductivity phase diagram for pressurized tetradymite topological insulators. Physical Review Materials, 2 (11), 10.1103/PhysRevMaterials.2.114203
DOI: doi:10.1103/PhysRevMaterials.2.114203
EISSN: 2475-9953
Pages: 2.11:114203-1 - 114203-6
Type of Material: Journal Article
Journal/Proceeding Title: Physical Review Materials
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.
Notes: Physical Review Materials. Volume 2, Issue 11, 13 November 2018, Article number 114203.

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