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We present evidence that in carbon-polyvinylchloride composites, consisting of aggregates of carbon spheres (100-400) dispersed in the insulating matrix, the electrical conductivity can be ascribed to a novel mechanism of tunneling with potential-barrier modulation by thermal fluctuations. Theoretical consideration of the tunneling-probability modification by thermal fluctuating electric field across tunnel junctions yields expressions for the temperature and the field dependences of the conductivity in excellent accord with experimental results.
Sheng et al. (Mon,) studied this question.