Peak effect in twinned superconductors

Details Peak effect in twinned superconductors Peak effect in twinned superconductors

1995-04-12

arxiv.org/abs/cond-mat/9504052v1

Physics

Condensed Matter

4 pages, revtex 3.0, no figures

Scientific paper

10.1103/PhysRevLett.75.2992

A sharp maximum in the critical current $J_c$ as a function of temperature just below the melting point of the Abrikosov flux lattice has recently been observed in both low and high temperature superconductors. This peak effect is strongest in twinned crystals for fields aligned with the twin planes. We propose that this peak signals the breakdown of the collective pinning regime and the crossover to strong pinning of single vortices on the twin boundaries. This crossover is very sharp and can account for the steep drop of the differential resistivity observed in experiments.

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