Critical vortex line length near a zigzag of pinning centers
Instituto de Física, Universidade Federal do Rio
C. P. 68528 CEP 21941-972, Rio de Janeiro, RJ, Brazil
Revised: 23 July 2004
Published online: 26 November 2004
A vortex line passes through as many pinning centers as possible on its way from one extremety of the superconductor to the other at the expense of increasing its self-energy. In the framework of the Ginzburg-Landau theory we study the relative growth in length, with respect to the straight line, of a vortex near a zigzag of defects. The defects are insulating pinning spheres that form a three-dimensional cubic array embedded in the superconductor. We determine the depinning transition beyond which the vortex line no longer follows the critical zigzag path of defects.
PACS: 74.80.-g – Spatially inhomogeneous structures / 74.25.-q – General properties; correlations between physical properties in normal and superconducting states / 74.20.De – Phenomenological theories (two-fluid, Ginzburg-Landau, etc.)
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2004