Antivortices due to competing orbital and paramagnetic pair-breaking effects

Details Antivortices due to competing orbital and paramagnetic pair-breaking effects Antivortices due to competing orbital and paramagnetic pair-breaking effects

2005-02-25

arxiv.org/abs/cond-mat/0502604v1

10th IVW Proceedings, Pramana, vol. 66, 209-217 (2006)

Physics

Condensed Matter

Superconductivity

11 pages, 3 figures

Scientific paper

10.1007/BF02704948

Thermodynamically stable vortex-antivortex structures in a quasi-two-dimensional superconductor in a tilted magnetic field are predicted. For this geometry, both orbital and spin pair-breaking effects exist, with their relative strength depending on the tilt angle \Theta. The spectrum of possible states contains as limits the ordinary vortex state (for large \Theta) and the Fulde-Ferrell-Larkin-Ovchinnikov state (for \Theta=0). The quasiclassical equations are solved near H_{c2} for arbitrary \Theta and it is shown that stable states with coexisting vortices and antivortices exist in a small interval close to \Theta=0. The results are compared with recent predictions of antivortices in mesoscopic samples.

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