J. Phys. I France 2 (1992) 503-510
Random media with temperature controlled connectivityF. Carmona, E. Valot, L. Servant and M. Ricci
Centre de Recherche Paul Pascal-CNRS, Av. A. Schweitzer, 33600 Pessac, France
(Received 3 March 1992, accepted 12 March 1992)
We show that the electrical resistance of a percolating medium made of a polymer filled with conductive particles may undergo a steep increase over a narrow temperature range above room temperature. We demonstrate that a likely mechanism for the effect is the loss of interparticle electrical contact inducing a weakening of the connectivity of the medium as temperature is increased.
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