Flux-Induced Vortex in Mesoscopic Superconducting Loops

Details Flux-Induced Vortex in Mesoscopic Superconducting Loops Flux-Induced Vortex in Mesoscopic Superconducting Loops

1997-11-06

arxiv.org/abs/cond-mat/9711043v4

Phys. Rev. B 59 (1999) 8896-8901

Physics

Condensed Matter

Superconductivity

6 pages, Latex, 4 figs., uses RevTex, extended to situations far from cylindrical symmetry

Scientific paper

10.1103/PhysRevB.59.8896

We predict the existence of a quantum vortex for an unusual situation. We study the order parameter in doubly connected superconducting samples embedded in a uniform magnetic field. For samples with perfect cylindrical symmetry, the order parameter has been known for long and no vortices are present in the linear regime. However, if the sample is not symmetric, there exist ranges of the field for which the order parameter vanishes along a line, parallel to the field. In many respects, the behavior of this line is qualitatively different from that of the vortices encountered in type II superconductivity. For samples with mirror symmetry, this flux-induced vortex appears at the thin side for small fluxes and at the opposite side for large fluxes. We propose direct and indirect experimental methods which could test our predictions.

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