Vortex Entanglement in Disordered Superconductors
K. V. Samokhin
DOI 10.1103/PhysRevLett.84.1304 · Physical Review Letters
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Abstract
Vortex entanglement and pinning in multiply connected disordered superconductors are studied. It is shown that the winding of vortices around repulsive obstacles is greatly enhanced by quenched columnar disorder and suppressed by point disorder, compared to the clean case. This leads to an additional contribution to the effective pinning force acting on vortices, which, unlike the conventional mechanisms of pinning, grows with temperature.
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