Numerical simulations of diffusion processes are performed on fractal aggregates designed to mimic the structure of inhomogeneous granular superconductors. The spectral dimensions obtained yield ftuctuation-conductivity exponents that are compared with experimental results on ceramic samples ofhigh-Tc oxides ofthe YBaCuO system.
Physical review. B, Condensed matter. New York. Vol. 42, no. 16 (Dec. 1990), p. 10030-10034