Dynamic Aspects of Strong Pinning

Details Dynamic Aspects of Strong Pinning Dynamic Aspects of Strong Pinning

2011-10-19

arxiv.org/abs/1110.4247v1

Physics

Condensed Matter

Superconductivity

4 pages, 2 figures

Scientific paper

We determine the current--voltage characteristic of type II superconductors in the presence of strong pinning centers. Focusing on a small density of defects, we derive a generic form for the characteristic with a linear flux-flow branch shifted by the critical current (excess-current characteristic). The details near onset, a hysteretic jump (for $\kappa \gg 1$) or a smooth velocity turn-on ($\kappa \to 1$), depend on the Labusch parameter $\kappa$ characterising the pinning centers. Pushing the single-pin analysis into the weak pinning domain, we reproduce the collective pinning results for the critical current.

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