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Peak Effect in Superconductors: Melting of Larkin Domains

Xinsheng Ling·Chao Tang·S. Bhattacharya·Paul M. Chaikin
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Abstract

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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Xinsheng Ling, Chao Tang, S. Bhattacharya, Paul M. Chaikin. 1995-04-26. Peak Effect in Superconductors: Melting of Larkin Domains. https://doi.org/10.1209/epl%2Fi1996-00157-x

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