Volume 70, Number 5, June 2005
|Page(s)||670 - 676|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||29 April 2005|
Field-enhanced critical parameters in magnetically nanostructured superconductors
Departement Fysica, Universiteit Antwerpen (Campus Middelheim) Groenenborgerlaan 171, B-2020 Antwerpen, Belgium
Accepted: 13 April 2005
Within the phenomenological Ginzburg-Landau theory, we demonstrate the enhancement of superconductivity in a superconducting film, when nanostructured by a lattice of magnetic particles. Arrays of out-of-plane magnetized dots (MDs) extend the critical magnetic field and critical current the sample can sustain, due to the interaction of the vortex-antivortex pairs and surrounding supercurrents induced by the dots and the external flux lines. Depending on the stability of the vortex-antivortex lattice, a peak in the Hext-T boundary is found for applied integer and rational matching fields, which agrees with recent experiments (Lange M. et al. , Phys. Rev. Lett., 90 (2003) 197006). Due to compensation of MDs- and Hext-induced currents, we predict the field-shifted jc-Hext characteristics, as was actually realized in previous experiment but not commented on (Morgan D. J. and Ketterson J. B., Phys. Rev. Lett., 80 (1998) 3614).
PACS: 74.78.-w – Superconducting films and low-dimensional structures / 74.25.Dw – Superconductivity phase diagrams / 74.25.Qt – Vortex lattices, flux pinning, flux creep
© EDP Sciences, 2005
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