Critical and non-critical coherence lengths in a two-band superconductor

Details Critical and non-critical coherence lengths in a two-band superconductor Critical and non-critical coherence lengths in a two-band superconductor

2012-01-27

arxiv.org/abs/1201.5748v1

Physics

Condensed Matter

Superconductivity

Accepted for publication in Journal of Superconductivity and Novel Magnetism

Scientific paper

We study the peculiarities of coherency in a two-gap superconductor. The both intraband couplings, inducing superconductivity in the independent bands, and interband pair-transfer interaction have been taken into account. On the basis of the Ginzburg-Landau equations derived from the Bogoliubov-de Gennes equations and the relevant self-consistency conditions for a two-gap system, we find critical and non-critical coherence lengths in the spatial behaviour of the fluctuations of order parameters. The character of the temperature dependencies of these length scales is determined by the relative contributions from intra- and interband interaction channels.

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