Dirty two-band superconductivity with interband pairing order

Yasuhiro Asano (Corresponding Author), Akihiro Sasaki, Alexander A. Golubov

Research output: Contribution to journalArticleAcademicpeer-review

4 Citations (Scopus)
56 Downloads (Pure)

Abstract

We study theoretically the effects of random nonmagnetic impurities on the superconducting transition temperature Tc in a two-band superconductor characterized by an equal-time s-wave interband pairing order parameter. Because of the two-band degree of freedom, it is possible to define a spin-triplet s-wave pairing order parameter as well as a spin-singlet s-wave order parameter. The former belongs to odd-band-parity symmetry class, whereas the latter belongs to even-band-parity symmetry class. In a spin-singlet superconductor, Tc is insensitive to the impurity concentration when we estimate the self-energy due to the random impurity potential within the Born approximation. On the other hand in a spin-triplet superconductor, Tc decreases with the increase of the impurity concentration. We conclude that Cooper pairs belonging to odd-band-parity symmetry class are fragile under the random impurity potential even though they have s-wave pairing symmetry.

Original languageEnglish
Article number043020
Number of pages10
JournalNew journal of physics
Volume20
Issue number4
DOIs
Publication statusPublished - 12 Apr 2018

Keywords

  • interband pair
  • random impurities
  • superconductivity
  • transition temperature
  • random impurites

Fingerprint Dive into the research topics of 'Dirty two-band superconductivity with interband pairing order'. Together they form a unique fingerprint.

  • Cite this