Noise exponent in superconducting-normal metal mixtures
P. M. Hui, D. Stroud
DOI 10.1103/PhysRevB.34.8101 · Physical Review B
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Abstract
The noise exponent κ′ is calculated in a superconductor-normal-conductor network near the percolation threshold using the Midgal-Kadanoff bond-moving method. In two dimensions, κ′=1.339=κ, where κ is the noise exponent in a normal conductor-insulator network, consistent with duality arguments. In three dimensions, κ′=0.660, which lies between the exact upper and lower bounds 0.38≤κ′≤1.02.
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