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Dirty two-band superconductivity with interband pairing order

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Title: Dirty two-band superconductivity with interband pairing order
Authors: Asano, Yasuhiro Browse this author →KAKEN DB
Sasaki, Akihiro Browse this author
Golubov, Alexander A. Browse this author
Keywords: superconductivity
interband pair
random impurites
transition temperature
Issue Date: 12-Apr-2018
Publisher: IOP Publishing
Journal Title: New Journal of Physics
Volume: 20
Start Page: 043020
Publisher DOI: 10.1088/1367-2630/aab954
Abstract: We study theoretically the effects of random nonmagnetic impurities on the superconducting transition temperature T-c 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.
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 浅野 泰寛

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