Is the term "type-1.5 superconductivity" warranted by Ginzburg-Landau theory?

Details Is the term "type-1.5 superconductivity" warranted by Ginzburg-Landau theory? Is the term "type-1.5 superconductivity" warranted by Ginzburg-Landau theory?

2010-08-03

arxiv.org/abs/1008.0581v2

Phys. Rev. B 83, 054515 (2011)

Physics

Condensed Matter

Superconductivity

5 pages, revised and extended version; previous title "Two-band superconductors near Tc" changed

Scientific paper

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.

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