Volume 73, Number 2, January 2006
|Page(s)||253 - 259|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||14 December 2005|
Unzipping flux lines from extended defects in type-II superconductors
Department of Physics, Harvard University - Cambridge, MA 02138, USA
2 Physicochimie Curie (CNRS-UMR168), Institut Curie, Section de Recherche 26 rue d'Ulm, 75248 Paris Cedex 05, France
3 Department of Physics, Technion - Haifa 32000, Israel
4 Department of Physics, Boston University - Boston, MA 02215, USA
Accepted: 25 November 2005
With magnetic force microscopy in mind, we study the unbinding transition of individual flux lines from extended defects like columnar pins and twin planes in type-II superconductors. In the presence of point disorder, the transition is universal with an exponent which depends only on the dimensionality of the extended defect. We also consider the unbinding transition of a single vortex line from a twin plane occupied by other vortices. We show that the critical properties of this transition depend strongly on the Luttinger liquid parameter which describes the long-distance physics of the two-dimensional flux line array.
PACS: 74.25.Qt – Vortex lattices, flux pinning, flux creep / 05.20.-y – Classical statistical mechanics / 74.25.-q – Properties of type I and type II superconductors
© EDP Sciences, 2006
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