Evidence for superlocalization on a fractal network in conductive carbon-black- polymer composites

D. van der Putten, J.T. Moonen, H.B. Brom, J.C.M. Brokken-Zijp, M.A.J. Michels

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Abstract

The dc conductivity of carbon-black–polymer composites has been measured as a function of carbon-black concentration from just above the percolation threshold pc up to 33pc, and in the temperature range from 4 to 300 K. To explain the temperature dependence we have modified the Mott-Deutscher model for variable-range hopping between superlocalized states on a fractal by assuming Coulomb-dominated hopping. Our data then yield the first experimental evidence of electron superlocalization, with a superlocalization exponent ζ=1.94±0.06, close to theoretical estimates. The derived localization length is of the right order of magnitude.
Original languageEnglish
Pages (from-to)494-497
JournalPhysical Review Letters
Volume69
Issue number3
DOIs
Publication statusPublished - 1992
Externally publishedYes

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