Ballistic and diffusive: theory of vortices in the two-band superconductor MgB2
arXiv:cond-mat/0512118 · doi:10.1103/PhysRevB.73.220501
Abstract
Motivated by the recent results on impurity effects in MgB2, we present a theoretical model for a two-band superconductor in which the character of quasiparticle motion is ballistic in one band and diffusive in the other. We apply our model to calculate the electronic structure in the vicinity of an isolated vortex. We assume that superconductivity in the diffusive (pi) band is induced by that in the clean (sigma) band, as suggested by experimental evidence for MgB2. We focus our attention to the spatial variations of the order parameter, the current density, and the vortex core spectrum in the two bands. Our results indicate that the coupling to the pi band can lead to the appearance of additional bound states near the gap edge in the sigma band that are absent in the single-band case.
4 pages, 4 figures
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Cited by in corpus (6)
- Type-1.5 superconductivity in multiband systems: magnetic response, broken symmetries and microscopic theory. A brief overview
- Quasiclassical numerical method for mesoscopic superconductors: bound states in a circular d-wave island with a single vortex
- Theory of vortices in hybridized ballistic/diffusive-band superconductors
- Type-1.5 superconductivity in muliband and other multicomponent systems
- Abrikosov flux-lines in two-band superconductors with mixed dimensionality
- Vortex core shrinkage in a two gap superconductor: application to MgB2