INFLUENCE OF THE MAGNETIC-FIELD SWEEP RATE ON FLUX-CREEP IN MELT-TEXTURED SAMPLE OF YBA2CU3O7-D

We investigated the influence of the field sweep rate dH/dt (3Oe/s les s than or equal to H/dt less than or equal to lkOe/s) on the flux cree p in a melt textured YBa2Cu3O7-d at different temperatures and for a f ixed fields parallel to the c-axis. The initial stage of the relaxatio n is imposed by the macroscopic sample dimension and the field sweep r ate. As a result, all the relaxation curves, at a given field and temp erature, collapse into a single one that is independent from the exper imental conditions by a transformation t-->t+tau in which tau is a tra nsient time. The experimental values of tau coincides well with litera ture.