Peak Effect in Superconductors: Melting of Larkin Domains

Details Peak Effect in Superconductors: Melting of Larkin Domains Peak Effect in Superconductors: Melting of Larkin Domains

1995-04-26

arxiv.org/abs/cond-mat/9504109v1

Europhys. Lett. 35 (1996) 597

Physics

Condensed Matter

13 pages, 2 figures, REVTEX

Scientific paper

10.1209/epl/i1996-00157-x

Motivated by the recent observations of the peak effect in high-$T_c$ YBCO superconductors, we reexamine the origin of this unusual phenomenon. We show that the mechanism based on the $k$-dependence (nonlocality) of the vortex-lattice tilt modulus $C_{44}({\bf k})$ cannot account for the essential feature of the peak effect. We propose a scenario in which the peak effect is related to the melting of Larkin domains. In our model, the rise of critical current with increasing temperature is a result of a crossover from the Larkin pinning length to the length scale set by thermally excited free dislocations.

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