Magnetic relaxation in the "Bragg-glass" phase in BSCCO

Details Magnetic relaxation in the "Bragg-glass" phase in BSCCO Magnetic relaxation in the "Bragg-glass" phase in BSCCO

1999-12-15

arxiv.org/abs/cond-mat/9912282v2

Physics

Condensed Matter

Superconductivity

2 pages, 3 figures submitted to conference proceedings of M2S-2000 Houston TX

Scientific paper

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)^{\mu} with 0.3 < \mu < 0.8 are possible at long times in excess of 100 s.

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