Microscopic characterization of the superconducting gap function in Sn1 -xInxTe
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.
- Publication:
-
Physical Review B
- Pub Date:
- January 2020
- DOI:
- 10.1103/PhysRevB.101.014505
- Bibcode:
- 2020PhRvB.101a4505N