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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. |
| Rights: | http://creativecommons.org/licenses/by/3.0/ |
| Type: | article |
| URI: | http://hdl.handle.net/2115/70449 |
| 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)
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Submitter: 浅野 泰寛
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