Giant dispersion of critical currents in superconductor with fractal clusters of a normal phase

Details Giant dispersion of critical currents in superconductor with fractal clusters of a normal phase Giant dispersion of critical currents in superconductor with fractal clusters of a normal phase

2003-03-10

arxiv.org/abs/cond-mat/0303161v1

Tech. Phys. Lett. 28 (2002) 568-571

Physics

Condensed Matter

Superconductivity

7 pages with 3 figures

Scientific paper

The influence of fractal clusters of a normal phase on the dynamics of a magnetic flux trapped in a percolative superconductor is considered. The critical current distribution and the current-voltage characteristics of fractal superconducting structures in the resistive state are obtained for an arbitrary fractal dimension of the cluster boundaries. The range of fractal dimensions, where the dispersion of critical currents becomes infinite, is found. It is revealed that the fractality of clusters depresses of the electric field caused by the magnetic flux motion thus increasing the critical current value. It is expected that the maximum current-carrying capability of a superconductor can be achieved in the region of giant dispersion of critical currents.

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