Fully gapped superconductivity in In-doped topological crystalline insulator Pb0.5Sn0.5Te
Abstract
In this study, superconductors derived from topological insulators and topological crystalline insulators by chemical doping have long been considered to be candidates as topological superconductors. Pb0.5Sn0.5Te is a topological crystalline insulator with mirror symmetry protected surface states on (001)-, (011)-, and (111)-oriented surfaces. The superconductor (Pb0.5Sn0.5)0.7In0.3Te is produced by In doping in Pb0.5Sn0.5Te, and is thought to be a topological superconductor. Here we report scanning tunneling spectroscopy measurements of the superconducting state as well as the superconducting energy gap in (Pb0.5Sn0.5)0.7In0.3Te on a (001)-oriented surface. The spectrum can be well fitted by an anisotropic s-wave gap function of Δ = 0.72 + 0.18cos4θ meV using Dynes model. The results show that the superconductor seems to be a fully gapped one without any in-gap states, in contradiction with the expectation of a topological superconductor.
- Authors:
-
- Nanjing Univ., Nanjing (China)
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Publication Date:
- Research Org.:
- Brookhaven National Laboratory (BNL), Upton, NY (United States); Energy Frontier Research Centers (EFRC) (United States). Center for Emergent Superconductivity (CES)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1226051
- Alternate Identifier(s):
- OSTI ID: 1202638
- Report Number(s):
- BNL-108427-2015-JA
Journal ID: ISSN 1098-0121; PRBMDO; R&D Project: PO010; KC0201060
- Grant/Contract Number:
- SC0012704; SC00112704
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review. B, Condensed Matter and Materials Physics
- Additional Journal Information:
- Journal Volume: 92; Journal Issue: 2; Journal ID: ISSN 1098-0121
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
Du, Guan, Gu, G. D., Du, Zengyi, Fang, Delong, Yang, Huan, Zhong, R. D., Schneeloch, J., and Wen, Hai -Hu. Fully gapped superconductivity in In-doped topological crystalline insulator Pb0.5Sn0.5Te. United States: N. p., 2015.
Web. doi:10.1103/PhysRevB.92.020512.
Du, Guan, Gu, G. D., Du, Zengyi, Fang, Delong, Yang, Huan, Zhong, R. D., Schneeloch, J., & Wen, Hai -Hu. Fully gapped superconductivity in In-doped topological crystalline insulator Pb0.5Sn0.5Te. United States. https://doi.org/10.1103/PhysRevB.92.020512
Du, Guan, Gu, G. D., Du, Zengyi, Fang, Delong, Yang, Huan, Zhong, R. D., Schneeloch, J., and Wen, Hai -Hu. Mon .
"Fully gapped superconductivity in In-doped topological crystalline insulator Pb0.5Sn0.5Te". United States. https://doi.org/10.1103/PhysRevB.92.020512. https://www.osti.gov/servlets/purl/1226051.
@article{osti_1226051,
title = {Fully gapped superconductivity in In-doped topological crystalline insulator Pb0.5Sn0.5Te},
author = {Du, Guan and Gu, G. D. and Du, Zengyi and Fang, Delong and Yang, Huan and Zhong, R. D. and Schneeloch, J. and Wen, Hai -Hu},
abstractNote = {In this study, superconductors derived from topological insulators and topological crystalline insulators by chemical doping have long been considered to be candidates as topological superconductors. Pb0.5Sn0.5Te is a topological crystalline insulator with mirror symmetry protected surface states on (001)-, (011)-, and (111)-oriented surfaces. The superconductor (Pb0.5Sn0.5)0.7In0.3Te is produced by In doping in Pb0.5Sn0.5Te, and is thought to be a topological superconductor. Here we report scanning tunneling spectroscopy measurements of the superconducting state as well as the superconducting energy gap in (Pb0.5Sn0.5)0.7In0.3Te on a (001)-oriented surface. The spectrum can be well fitted by an anisotropic s-wave gap function of Δ = 0.72 + 0.18cos4θ meV using Dynes model. The results show that the superconductor seems to be a fully gapped one without any in-gap states, in contradiction with the expectation of a topological superconductor.},
doi = {10.1103/PhysRevB.92.020512},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 2,
volume = 92,
place = {United States},
year = {Mon Jul 27 00:00:00 EDT 2015},
month = {Mon Jul 27 00:00:00 EDT 2015}
}
Web of Science
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