Berlin 2005 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 23: Posters Superconductivity, Solids at Low Temperature

TT 23.45: Poster

Montag, 7. März 2005, 14:00–18:00, Poster TU D

Vortex core structure of a two-gap superconductor — •Andreas Gumann, Siegfried Graser, Thomas Dahm und Nils Schopohl — Universität Tübingen, Lehrstuhl für Theoretische Festkörperphysik, Auf der Morgenstelle 14, 72076 Tübingen, Germany

The recently discovered superconductor MgB₂ is believed to be a superconductor with two gaps. A single vortex line in such a system thus consists of two components, which are coupled to each other. Here, we present theoretical calculations of the core structure of such a vortex. Recently, it has been argued that Ginzburg-Landau theory cannot give a sufficient description of this situation. Therefore, we use quasiclassical Eilenberger theory employing the Riccati method. We present results for the self-consistently determined gap function and the local density of states in the vicinity of the vortex in the clean limit.