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Ginzburg-Landau Theory of Dirty Two Band s± Superconductors

Authors Ng, Tai Kai
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
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