Different length-scales for order parameters in two-gap superconductors: the extended Ginzburg-Landau theory

Details Different length-scales for order parameters in two-gap superconductors: the extended Ginzburg-Landau theory Different length-scales for order parameters in two-gap superconductors: the extended Ginzburg-Landau theory

2011-06-06

arxiv.org/abs/1106.1080v1

Phys. Rev. B 84, 064522 (2011)

Physics

Condensed Matter

Superconductivity

5 pages, 4 figures

Scientific paper

10.1103/PhysRevB.84.064522

Using the Ginzburg-Landau theory extended to the next-to-leading order we determine numerically the healing lengths of the two order parameters at the two-gap superconductor/normal metal interface. We demonstrate on several examples that those can be significantly different even in the strict domain of applicability of the Ginzburg-Landau theory. This justifies the use of this theory to describe relevant physics of two-gap superconductors, distinguishing them from their single-gap counterparts. The calculational degree of complexity increases only slightly with respect to the conventional Ginzburg-Landau expansion, thus the extended Ginzburg-Landau model remains numerically far less demanding compared to the full microscopic approaches.

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