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Nonuniversal critical behavior in the critical current of superconducting composites

M. Octavio, A. Octavio, J. Aponte, R. Medina, C. J. Lobb

DOI 10.1103/PhysRevB.37.9292 · Physical Review B

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Abstract

We report the results of numerical simulations of two-dimensional percolative networks of superconductors. Near the percolation threshold pc, the critical current density Jc of these networks varies as (p-pc)v, where p is the fraction of superconducting material present. The exponent v is found to be dependent on the microstructure of the network. Excellent agreement is obtained between our numerical values of v and predictions for v based on the nodes-links-blobs-necks model.

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