Vortex Penetration into a Type II Superconductor due to a Mesoscopic External Current

Details Vortex Penetration into a Type II Superconductor due to a Mesoscopic External Current Vortex Penetration into a Type II Superconductor due to a Mesoscopic External Current

2008-10-22

arxiv.org/abs/0810.4125v1

Phys. Rev. B 79, 024503 (2009)

Physics

Condensed Matter

Superconductivity

9 pages, 14 figures

Scientific paper

Applying the London theory we study curved vortices produced by an external current near and parallel to the surface of a type II superconductor. By minimizing the energy functional we find the contour describing the hard core of the flux line, and predict the threshold current for entrance of the first vortex. We assume that the vortex entrance is allowed due to surface defects, despite the Bean-Livingston barrier. Compared to the usual situation with a homogeneous magnetic field, the main effect of the present geometry is that larger magnetic fields can be applied locally before vortices enter the superconducting sample. It is argued that this effect can be further enhanced in anisotropic superconductors.

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