Berlin 2008 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 26: Superconductivity: Vortex Dynamics, Vortex Phases, Pinning
TT 26.9: Vortrag
Mittwoch, 27. Februar 2008, 18:00–18:15, H 3010
Effect of planar defects on the stability of the Bragg glass phase of type-II superconductors — •Aleksandra Petković1, Thorsten Emig1,2, and Thomas Nattermann1 — 1Institut für Theoretische Physik der Universität zu Köln — 2Laboratoire de Physique Théorique et Modèles Statistiques, CNRS UMR 8626, Bât. 100, Université Paris-Sud, 91405 Orsay cedex, France
It is shown that the Bragg glass phase can become unstable with respect to planar defects. A single defect plane that is oriented parallel to the magnetic field as well as to one of the main axis of the Abrikosov flux line lattice is always relevant, whereas we argue that a plane with higher Miller index is irrelevant. A finite density of parallel defects with random separations can be relevant even for larger Miller indices. Defects that are aligned with the applied field restore locally the flux density oscillations which decay algebraically with distance from the defect. We calculate the current voltage relation. The theory exhibits some similarities to the physics of Luttinger liquids with impurities.