| Issue |
Europhys. Lett.
Volume 54, Number 5, June 2001
|
|
|---|---|---|
| Page(s) | 566 - 572 | |
| Section | General | |
| DOI | https://doi.org/10.1209/epl/i2001-00285-3 | |
| Published online | 01 December 2003 | |
Off-equilibrium properties of vortex creep in superconductors
1
Department of Mathematics, Imperial College 180 Queen's Gate,
London SW7 2BZ, UK
2
Università di Napoli "Federico II",
Dipartimento di Scienze Fisiche INFM and INFN - Via Cintia, 80126 Napoli, Italy
Received:
11
December
2000
Accepted:
29
March
2001
We study a model for the dynamics of vortices in type-II superconductors. In particular, we discuss glassy "off-equilibrium" properties and "aging"in magnetic creep. At low temperatures a crossover point is found, Tg, where relaxation times seem to diverge à la Vogel-Tamman-Fulcher. Magnetic creep changes by crossing Tg: above Tg power law creep is found asymptotically followed by stretched exponential saturation; below Tg the creep is logarithmic and vortex motion strongly subdiffusive. In this region violation of time translation invariance is found along with important dynamical scaling properties.
PACS: 05.50.+q – Lattice theory and statistics (Ising, Potts, etc.) / 75.10.-b – General theory and models of magnetic ordering / 47.32.Cc – Vortex dynamics
© EDP Sciences, 2001
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