Nonuniversal breakdown behavior in superconducting and dielectric composites
C. J. Lobb, P. M. Hui, D. Stroud
DOI 10.1103/PhysRevB.36.1956 · Physical Review B
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Abstract
We discuss the critical current density Jc of composites where a fraction p of the material is superconducting and the dielectric breakdown electric field Ec of composites where a fraction p of the material is metallic. Both of these nonlinear processes are characterized by power-law behavior near the percolation threshold pc, Jc∝(p-pc)v and Ec∝(pc-p)y. The exponents v and y are nonuniversal, depending strongly on both the dimensionality and microstructure of the composite.
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