Volume 74, Number 3, May 2006
|Page(s)||493 - 499|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||29 March 2006|
Superconducting films with antidot arrays —Novel behavior of the critical current
Departement Fysica, Universiteit Antwerpen Groenenborgerlaan 171, B-2020 Antwerpen, Belgium
Accepted: 3 March 2006
Novel behavior of the critical current density jc of a regularly perforated superconducting film is found, as a function of applied magnetic field H. Previously pronounced peaks of jc at matching fields were always found to decrease with increasing H. Here we found a reversal of this behavior for particular geometrical parameters of the antidot lattice and/or temperature. This new phenomenon is due to a strong “caging” of interstitial vortices between the pinned ones. We show that this vortex-vortex interaction can be further tailored by an appropriate choice of the superconducting material, described by the Ginzburg-Landau parameter κ. In effective type-I samples we predict that the peaks in at the matching fields are transformed into a step-like behavior.
PACS: 74.25.Sv – Critical currents / 74.78.-w – Superconducting films and low-dimensional structures / 74.25.-q – Properties of type I and type II superconductors
© EDP Sciences, 2006
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