Electronic state around vortex in a two-band superconductor

Details Electronic state around vortex in a two-band superconductor Electronic state around vortex in a two-band superconductor

2004-09-16

arxiv.org/abs/cond-mat/0409413v1

Phys. Rev. B 70, 144508 (2004)

Physics

Condensed Matter

Superconductivity

6 pages, 6 figures, to appear in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.70.144508

Based on the quasiclassical theory, we investigate the vortex state in a two-band superconductor with a small gap on a three dimensional Fermi surface and a large gap on a quasi-two dimensional one, as in MgB_2. The field dependence of zero-energy density of states is compared for fields parallel and perpendicular to the ab plane, and the anisotropy of the vortex core shape is discussed for a parallel field. The Fermi surface geometry of two-bands, combining the effect of the normal-like electronic state on the small gap band at high fields, produces characteristic behavior in the anisotropy of c- and ab-directions.

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