Volume 65, Number 4, February 2004
|Page(s)||540 - 545|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|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
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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