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Title: Ginzburg-Landau theory of dirty two band s± superconductors
Authors: Ng, Tai-Kai
Keywords: Ginzburg-Landau theory
Multigap superconductors
Issue Date: 4-Dec-2009
Citation: Physical review letters, v. 103, iss. 23, 236402, 4 December 2009
Abstract: 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.
Rights: Physical Review Letters © copyright (2009) American Physical Society. The Journal's web site is located at
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