Comment on “Ginzburg-Landau theory of two-band superconductors: Absence of type-1.5 superconductivity”
Egor Babaev, Mihail Silaev
DOI 10.1103/PhysRevB.86.016501 · Physical Review B
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Abstract
The recent paper by V. G. Kogan and J. Schmalian [Phys. Rev. B 83, 054515 (2011)] argues that the widely used two-component Ginzburg-Landau (GL) models are not correct, and further concludes that in the regime which is described by a GL theory there could be no disparity in the coherence lengths of two superconducting components. This would in particular imply that [in contrast to U(1)×U(1) superconductors] there could be no “type-1.5” superconducting regime in U(1) multiband systems for any finite interband coupling strength. We point out that these claims are incorrect and based on an erroneous scheme of reduction of a two-component GL theory.
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