Capacitive noise spectra of a disordered material

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Abstract
We report here the first attempt to test the results of cluster theory on a real, practical composite. For this purpose we have calculated the noise-power spectra of the capacitance between a riding capacitive probe and conducting composite using results of percolating-cluster theories. Comparison of the experimental results obtained on a carbon-black–polyvinylchloride composite confirms the predictions obtained from the above calculations. In particular it appears that the percolation-correlation length for composites can be estimated from the noise-power measurements.

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