Green's-function theory of dirty two-band superconductivity

Yasuhiro Asano, Alexander A. Golubov

Research output: Contribution to journalArticleAcademicpeer-review

5 Citations (Scopus)
57 Downloads (Pure)

Abstract

We study the effects of random nonmagnetic impurities on the superconducting transition temperature Tc in a two-band superconductor, where we assume an equal-time spin-singlet s-wave pair potential in each conduction band and the hybridization between the two bands as well as the band asymmetry. In the clean limit, the phase of hybridization determines the stability of two states, called s++ and s+-. The interband impurity scatterings decrease Tc of the two states exactly in the same manner when time-reversal symmetry is preserved in the Hamiltonian. We find that a superconductor with larger hybridization shows more moderate suppression of Tc. This effect can be explained by the presence of odd-frequency Cooper pairs, which are generated by the band hybridization in the clean limit and are broken by impurities.

Original languageEnglish
Article number214508
JournalPhysical review B: Covering condensed matter and materials physics
Volume97
Issue number21
DOIs
Publication statusPublished - 12 Jun 2018

Fingerprint Dive into the research topics of 'Green's-function theory of dirty two-band superconductivity'. Together they form a unique fingerprint.

  • Cite this