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Ginzburg-Landau Theory of Dirty Two Band s± Superconductors

Authors Ng, Tai Kai View this author's profile
Issue Date 2009
Source Physical Review Letters , v. 103, (23), December 2009, article number 236402
Summary In this Letter, we study the effect of nonmagnetic impurities on two-band superconductors by deriving the corresponding Ginzburg-Landau equation. Depending on the strength of (impurity-induced) interband scattering, we find that there are two distinctive regions where the superconductors behave very differently. In the strong impurity-induced interband scattering regime Tc ≪ τt−1, where τt ∼ mean lifetime an electron stays in one band, the two-band superconductor behaves as an effective one-band dirty superconductor. In the other limit Tc ≥ τt−1, the dirty two-band superconductor is described by a network of frustrated two-band superconductor grains connected by Josephson tunneling junctions, and the Anderson theorem breaks down.
ISSN 0031-9007
Rights © 2009 The American Physical Society
Language English
Format Article
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