| Issue |
Europhys. Lett.
Volume 65, Number 4, February 2004
|
|
|---|---|---|
| Page(s) | 540 - 545 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2003-10123-2 | |
| Published online | 01 February 2004 | |
Current-dependent crossover in the flux
dynamics of 
thin films
Dipartimento di Fisica “E. R. Caianiello”, Università di Salerno and INFM/Coherentia - Via S. Allende, I-84081 Baronissi (SA), Italy
Received:
19
June
2003
Accepted:
10
December
2003
We have investigated the dissipative behaviour of
textured thin films at different perpendicular magnetic fields H
and bias currents J, to study activation energy dependencies
and 
. For 
, where J* is a
magnetic-field–dependent crossover current, activation energies
are weakly current dependent, 
const, while, for
, 
. At , the magnetic-energy
dependencies are logarithmic, 
, while for ,
, up to 
. The 
curve separates two zones with different vortex dynamics. We
discuss the curve in terms of a current-driven
transition from a thermally activated flux flow to a flux creep
regime. For pronounced disorder, the data suggest the influence
of the activation energy distribution on the and
dependencies.
PACS: 74.78.-w – Superconducting films and low-dimensional structures
© EDP Sciences, 2004
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