Microscopic characterization of the superconducting gap function in Sn1-x InxTe

T. Nomoto, M. Kawamura, T. Koretsune, R. Arita, T. Machida, T. Hanaguri, M. Kriener, Y. Taguchi, Y. Tokura

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Abstract

Superconductivity in the doped topological crystalline insulator Sn1-xInxTe is studied by first-principles calculation based on superconducting density functional theory (SCDFT) and tunneling spectroscopy. By considering the spin-orbit coupling and frequency dependence of the screened Coulomb interaction in SCDFT, we succeed in reproducing the critical temperature of Sn1-xInxTe quantitatively, in which the spin-orbit coupling is found to play an essential role. The leading gap function is a conventional s wave with moderate anisotropy in k space, and we find that the subdominant odd-parity instability is significantly weaker than the s-wave instability. We perform tunneling spectroscopy measurement and confirm that the spectrum is consistent with the calculated gap function.

Original languageEnglish
Article number014505
JournalPhysical Review B
Volume101
Issue number1
DOIs
Publication statusPublished - 2020 Jan 8

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Nomoto, T., Kawamura, M., Koretsune, T., Arita, R., Machida, T., Hanaguri, T., Kriener, M., Taguchi, Y., & Tokura, Y. (2020). Microscopic characterization of the superconducting gap function in Sn1-x InxTe. Physical Review B, 101(1), [014505]. https://doi.org/10.1103/PhysRevB.101.014505