Conditions for non-monotonic vortex interaction in two-band superconductors

Details Conditions for non-monotonic vortex interaction in two-band superconductors Conditions for non-monotonic vortex interaction in two-band superconductors

2011-05-12

arxiv.org/abs/1105.2403v1

Phys. Rev. B 83, 214523 (2011)

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1103/PhysRevB.83.214523

We describe a semi-analytic approach to the two-band Ginzburg-Landau theory, which predicts the behavior of vortices in two-band superconductors. We show that the character of the short-range vortex-vortex interaction is determined by the sign of the normal domain - superconductor interface energy, in analogy with the conventional differentiation between type-I and type-II superconductors. However, we also show that the long-range interaction is determined by a modified Ginzburg-Landau parameter $\kappa^*$, different from the standard $\kappa$ of a bulk superconductor. This opens the possibility for non-monotonic vortex-vortex interaction, which is temperature-dependent, and can be further tuned by alterations of the material on the microscopic scale.

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