Regensburg 2007 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 34: Superconductivity - Vortex Dynamics, Vortex Phases, Pinning

TT 34.7: Vortrag

Freitag, 30. März 2007, 12:00–12:15, H19

Vortex lattice in superconducting films of finite thickness — •Ernst Helmut Brandt — Max-Planck-Institut für Metallforschung, Stuttgart

Magnetic stray field, currents, self-energy, and interaction of vortices in superconductor films of any thickness are of interest for numerous applications. In the London limit of negligibly small vortex core, the general analytical solution for arbitrary arrangements of straight and curved vortex lines is given in [1]. For finite vortex core size, the corresponding solution of Ginzburg-Landau theory is needed, which requires huge numerical effort. However, if the vortex lattice is ideally periodic in the film plane, the problem simplifies and an extension of a previous bulk method is possible, which includes the stray field energy outside the film. This calculation was performed for vortices oriented perpendicular to the film [2]. A similar computation is possible also for a periodic arrangement of arbitrarily tilted or curved vortex lines in a thick film.

[1] G. Carneiro and E. H. Brandt, Phys. Rev. B 61, 6370 (2000).

[2] E. H. Brandt, Phys. Rev. B 71, 014521, 1-12 (2005).