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Charge transfer in carbon composites based on fullerenes and exfoliated graphite

Abstract

Kinetic processes have been studied in composites based on fullerenes and exfoliated graphite at the initial proportions of components from 1: 16 to 16: 1 in mass. The samples are produced by heat treatment of initial dispersed mixtures in vacuum in the diffusion–adsorption process, their further cold pressing, and annealing. It is shown that the annealing almost does not influence the conduction mechanisms and only induces additional structural defects acting as electron traps. As a whole, the results obtained at the noted proportions of components make it possible to consider the material as a compensated metallic system with a structural disorder in which the charge transfer at temperatures from 4.2 K to room temperature is controlled by quantum interference phenomena. At low temperatures, the effect of a weak localization is observed, and the electron–electron interactions take place at medium and high temperatures.

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Correspondence to V. I. Berezkin.

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Original Russian Text © V.I. Berezkin, 2017, published in Fizika Tverdogo Tela, 2017, Vol., No. 7, pp. 1432–1439.

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Berezkin, V.I. Charge transfer in carbon composites based on fullerenes and exfoliated graphite. Phys. Solid State 59, 1460–1467 (2017). https://doi.org/10.1134/S1063783417070022

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