Abstract
In weak magnetic fields, precision measurements of the magnetic moment relaxation in thin epitaxial films YBa2Cu3O7−δ are performed. The exponents µ of the dependence of the vortex motion activation energy on the current are determined in a wide temperature range. Despite the low vortex density, the data obtained indicate the collective nature of their creep, which is probably caused by the strong interaction of vortices through the space surrounding the film.
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