Core Strings and Flux Spreading Near Pinning Centers

Details Core Strings and Flux Spreading Near Pinning Centers Core Strings and Flux Spreading Near Pinning Centers

2001-11-27

arxiv.org/abs/cond-mat/0111502v1

Physics

Condensed Matter

Superconductivity

5 pages, 4 figures

Scientific paper

At the nucleus of a superconducting vortex is a small, circular region where superconductivity is destroyed. Like an atomic nucleus, this core may become deformed, and such distortions can have important consequences in non-equilibrium situations. Using Ginzburg-Landau theory, we have investigated this phenomenon for vortices in the presence of artificial defects. We show that when a vortex approaches the vicinity of a defect, an abrupt transition occurs in which the vortex core develops a "string" extending to the defect boundary, while simultaneously the supercurrents and associated magnetic flux spread out and engulf the defect. The energetics of stretching the string determines the pinning behavior of the vortex. Experimental consequences of these strings are discussed.

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