2024-03-29T14:18:33Zhttps://eprints.lib.hokudai.ac.jp/dspace-oai/requestoai:eprints.lib.hokudai.ac.jp:2115/704492022-11-17T02:08:08Zhdl_2115_20045hdl_2115_139Dirty two-band superconductivity with interband pairing orderAsano, YasuhiroSasaki, AkihiroGolubov, Alexander A.superconductivityinterband pairrandom impuritestransition temperature428We 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.IOP PublishingJournal Articleapplication/pdfhttp://hdl.handle.net/2115/70449https://eprints.lib.hokudai.ac.jp/dspace/bitstream/2115/70449/1/Asano_2018_New_J._Phys._20_043020.pdf1367-2630New Journal of Physics200430202018-04-12enginfo:doi/10.1088/1367-2630/aab954http://creativecommons.org/licenses/by/3.0/publisher