Abstract
Local magnetic relaxation measurements were performed on Bi2Sr2CaCu2O8+x (BSCCO) single crystals using a Hall-sensor array. The recorded field profiles provide unambiguous evidence of a crossover from surface barrier to bulk pinning in the second magnetization peak region. Both contributions to the magnetization exhibit a pronounced relaxation. For fields above the second peak we observe an additional crossover from bulk-pinning at short time scales, with Bean-like profiles, to dome-shape profiles originating from surface barrier at long times.
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