Irreversibility, Mechanical Entanglement and Thermal Melting in Superconducting Vortex Crystals with Point Impurities

Deniz Ertas; David R. Nelson

doi:10.1016/S0921-4534(96)00563-1

paper

Irreversibility, Mechanical Entanglement and Thermal Melting in Superconducting Vortex Crystals with Point Impurities

arXiv:cond-mat/9607142 · doi:10.1016/S0921-4534(96)00563-1

Abstract

We discuss the onset of irreversibility and entanglement of vortex lines in high Tc superconductors due to point disorder and thermal fluctuations using a simplified cage model. A combination of Flory arguments, known results from directed polymers in random media, and a Lindemann criterion are used to estimate the field and temperature dependence of irreversibility, mechanical entanglement and thermal melting. The qualitative features of this dependence, including its nonmonotonicity when disorder is sufficiently strong, are in good agreement with recent experiments.

7 pages, uses RevTeX, multicol.sty and epsf.sty, 5 EPS figures included

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Columnar defects and vortex fluctuations in layered superconductors
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