Instabilities of the Vortex Lattice and the Peak Effect in Single Crystal YBa 2 Cu 4 O 8

We report on the measurements of the remnant magnetization, and hence critical current, in a single crystal of YBa₂Cu₄O₈. A peak in the temperature dependence of the critical current is observed when the external magnetic field is tilted away from the a−b planes. The observed behavior is attributed to a thermally activated instability-driven vortex-lattice splitting or vortex chain formation. The nature of the peak and the possibility of a thermally-activated dimensional crossover have been discussed.

Abstract licence: CC BY

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