Volume 79, Number 4, August 2007
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||23 July 2007|
Threefold onset of vortex loops in superconductors with a magnetic core
Departement Fysica Universiteit Antwerpen - Groenenborgerlaan 171, B-2020 Antwerpen, Belgium
2 Instituto de Física, Universidade Federal do Rio de Janeiro - C.P. 68528, 21941-972, Rio de Janeiro RJ, Brazil
3 Department of Physics, University of Bath - Claverton Down, BA2 7AY Bath, UK
Corresponding author: email@example.com
Accepted: 27 June 2007
A magnetic inclusion inside a superconductor gives rise to a fascinating complex of vortex loops. Our calculations, done in the framework of the Ginzburg-Landau theory, reveal that loops always nucleate in triplets around the magnetic core. In a mesoscopic superconducting sphere, the final superconducting state is characterized by those confined vortex loops and the ones that eventually spring to the surface of the sphere, evolving into vortex pairs piercing through the sample surface.
PACS: 74.25.Ha – Magnetic properties / 74.25.Op – Mixed state, critical fields, and surface sheaths / 74.78.Na – Mesoscopic and nanoscale systems
© Europhysics Letters Association, 2007
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