Columnar defects and vortex fluctuations in layered superconductors

Details Columnar defects and vortex fluctuations in layered superconductors Columnar defects and vortex fluctuations in layered superconductors

1995-10-07

arxiv.org/abs/cond-mat/9510038v1

Phys. Rev. B {\bf 53} R8855 (1996)

Physics

Condensed Matter

5 pages, REVTeX, no figures

Scientific paper

10.1103/PhysRevB.53.R8855

We investigate fluctuations of Josephson-coupled pancake vortices in layered superconductors in the presence of columnar defects. We study the thermodynamics of a single pancake stack pinned by columnar defects and obtain the temperature dependence of localization length, pinning energy and critical current. We study the creep regime and compute the crossover current between line-like creep and pancake-like creep motion. We find that columnar defects effectively increase interlayer Josephson coupling by suppressing thermal fluctuations of pancakes. This leads to an upward shift in the decoupling line most pronounced around the matching field.

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