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TT: Fachverband Tiefe Temperaturen

TT 8: Superconductivity - Poster Session

TT 8.15: Poster

Montag, 26. März 2007, 14:00–17:45, Poster A

Influence of Andreev bound states on the screening current and the magnetic field in a d-wave superconductor. — •Alexander Markowsky, Thomas Dahm, and Nils Schopohl — Universität Tübingen, Lehrstuhl für Theoretische Festkörperphysik, Auf der Morgenstelle 14, 72076 Tübingen

In the present work, we investigate how the Meissner-Ochsenfeld effect is modified near a surface of a d-wave superconductor. In a d-wave superconductor, surface Andreev bound states form within the energy gap depending on the orientation of the d-wave pairing condensate with respect to the boundary. By means of the Eilenberger theory, we study the influence of an external magnetic field on the Andreev bound states and the screening currents. In particular, the current changes its direction at the surface and a splitting of the bound state can be seen. We study the temperature dependence and orientational dependence of this effect.