Magnetic relaxation in the "Bragg-glass" phase in BSCCO
arXiv:cond-mat/9912282 · doi:10.1016/S0921-4534(00)00891-1
Abstract
Magnetic relaxation in the Bragg-glass phase of overdoped Bi_2Sr_2CaCu_2O_8 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 \sim \exp(- j_{c} / j)^μ with 0.3 < μ< 0.8 are possible at long times in excess of 100 s.
2 pages, 3 figures submitted to conference proceedings of M2S-2000 Houston TX