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

TL;DR

This study investigates magnetic relaxation in the Bragg-glass phase of overdoped BSCCO crystals using magneto-optical imaging, revealing a power-law current-voltage relation and stretched exponential behavior at long times.

Contribution

It provides the first detailed analysis of magnetic relaxation in the Bragg-glass phase of BSCCO using time-resolved magneto-optical visualization.

Findings

Current-voltage characteristic follows a power-law.

Stretched exponential fits are possible at long times.

Magnetic relaxation behavior is characterized in the Bragg-glass phase.

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