Physics – Condensed Matter – Superconductivity
Scientific paper
1998-06-09
Physics
Condensed Matter
Superconductivity
19 pages, 4 figures, submitted to Journal of Physics: Condensed Matter text in Frensh, abstract and captions in English
Scientific paper
A slab in parallel field is submitted to a step-like magnetic-field excitation, of amplitude 1--10 G, in the same direction as the applied field. The slab has been rolled or spark cut, without special care, from a conventional superconductor ingot (lead-indium alloy), and its critical currents have standard values. The transitory electric field, induced on a face of the slab, has been measured. Thus, we obtain information about the magnetic flux penetrating and vortices entering the sample through this face. The only observed deviation from the ideal response is that magnetic-field diffusion being limited by surface screening, associated with a superficial critical-current density. Otherwise, the vortex array inside the slab responds exactly as if bulk pinning were ineffective.
Mathieu Pierre
Plaçais Bernard
Simon Yvan
Vasseur Hugues
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