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Ginzburg-Landau theory of two-band superconductors: Absence of type-1.5 superconductivity

2011; American Physical Society; Volume: 83; Issue: 5 Linguagem: Inglês

10.1103/physrevb.83.054515

1550-235X

V. G. Kogan, Jörg Schmalian,

Physics of Superconductivity and Magnetism

It is shown that within the Ginzburg-Landau (GL) approximation the order parameters Delta1(r, T) and Delta2(r, T) in two-band superconductors vary on the same length scale, the difference in the zero-T coherence lengths xi0_i ~vF_i/Delta_i(0), i = 1, 2 notwithstanding. This amounts to a single physical GL parameter kappa and the classic GL dichotomy: kappa < 1/sqrt(2) for type-I and kappa > 1/sqrt(2) for type-II.