The break-up of the vortex structure in a mesoscopic wire containing a constrictionA. K. Elmurodov1, D. Y. Vodolazov1, 2 and F. M. Peeters1
1 Departement Fysica, Universiteit Antwerpen - Groenenborgerlaan 171 B-2020 Antwerpen, Belgium
2 Institute for Physics of Microstructures, Russian Academy of Sciences 603950 Nizhny Novgorod, GSP-105, Russia
received 8 November 2005; accepted in final form 2 February 2006
published online 22 February 2006
Within the nonlinear Ginzburg-Landau theory, we study the superconducting state in a mesoscopic wire containing a narrow constriction in the presence of a uniform magnetic field directed along the wire. If the narrow region is small enough so that no vortices can penetrate through it, curved vortices are formed, i.e. they enter at the top of the sample (the widest part) and exit near the constriction. At high magnetic fields a giant vortex is nucleated in the widest part of the wire which breaks up into a smaller giant and/or individual vortices near the constriction.
74.25.-q - Properties of type I and type II superconductors.
74.25.Qt - Vortex lattices, flux pinning, flux creep.
74.78.-w - Superconducting films and low-dimensional structures.
© EDP Sciences 2006