Electronic state around vortex in a two-band superconductor

Abstract

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.

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

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• Penetration depth, multiband superconductivity, and absence of muon-induced perturbation in superconducting PrOs${}_4$Sb${}_{12}$
• Theory of pairing symmetry in Fulde-Ferrell-Larkin-Ovchinnikov vortex state and vortex lattice
• Locking of length scales in two-band superconductors
• Rotation of Triangular Vortex Lattice in the Two-Band Superconductor MgB2
• Effect of Delocalized Vortex Core States on the Specific Heat of Nb
• Hidden Crossover Phenomena in Strongly Pauli Limited Multiband Superconductors ---Application to CeCu${}_2$Si${}_2$
• Interplay between effective mass anisotropy and Pauli paramagnetic effects in a multiband superconductor--Application to Sr2RuO4--
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• Knight shift spectrum in vortex states in s-wave and d-wave superconductors on the basis of Eilenberger theory
• Impurity Scattering Rate and Coherence factor in Vortex Core of Sign-reversing s-wave Superconductors
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• Direct visualization of quasiparticle concentration around superconducting vortices
• Abrikosov flux-lines in two-band superconductors with mixed dimensionality
• Quasiclassical Theory for Thermodynamic Properties of the Two-Band Superconductor MgB${}_2$ under Magnetic Fields