Magnetic relaxation in the "Bragg-glass" phase in BSCCO
C. J. van der Beek, S. Colson, M. Konczykowski, M. V. Indenbom, R. J. Drost, P. H. Kes
Abstract
Magnetic relaxation in the Bragg-glass phase of overdoped Bi2Sr2CaCu2O8 crystals was investigated using time-resolved magneto-optical visualisation of the flux distribution. This has permitted us to extract the current-voltage characteristic, which can be well described by a power-law, although fits to a stretched exponential E (- jc / j)μ with 0.3 < μ< 0.8 are possible at long times in excess of 100 s.
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