Diamagnetic Susceptibility and Current Distributions in Granular Superconductors at Percolation

Details Diamagnetic Susceptibility and Current Distributions in Granular Superconductors at Percolation Diamagnetic Susceptibility and Current Distributions in Granular Superconductors at Percolation

1999-06-09

arxiv.org/abs/cond-mat/9906134v2

Physics

Condensed Matter

Scientific paper

10.1103/PhysRevB.61.11336

Comments: 4 pages RevTeX, 4 Postscript figures. References added. We study a two-dimensional granular superconducting network at the percolation threshold under the influence of an external perpendicular magnetic field. By numerical simulations on the full nonlinear problem, we determine the scaling exponent for the magnetic susceptibility. Further, we report on the scaling properties of the current distribution. The scaling of the current is found to be independent of the value of the magnetic field. Our results are in contradiction with previous numerical results based on linearized equations. We find a value for the susceptibility exponent which does not agree with existing theoretical suggestions, but agrees perfectly with renormalization group calculations.

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