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The dynamics of magnetic flux distributions across a YBaCuO strip carryingtransport current is measured using magneto-optical imaging at 20 K. Thecurrent is applied in pulses of 40-5000 ms duration and magnitude close to thecritical one, 5.5 A. During the pulse some extra flux usually penetrates thestrip, so the local field increases in magnitude. When the strip is initiallypenetrated by flux, the local field either increases or decreases dependingboth on the spatial coordinate and the current magnitude. Meanwhile, thecurrent density always tends to redistribute more uniformly. Despite therelaxation, all distributions remain qualitatively similar to the Bean modelpredictions.Comment: RevTeX, 9 pages, 9 figures, submitted to Supercond. Sci. Technol.  Revision: MO image and more refs are adde

Relaxation of transport current distribution in a YBaCuO strip studied by magneto-optical imaging