The conductivity in cermets and in granular films is known to vary as exp [-(To/T)1/2], but the existing theories for such a behaviour have been subjected to criticism. A few new possible models for the observed behaviour are considered here. Most of them cannot explain the observations. The best of those that we examined is based on correlated hopping in a Coulomb gap.
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Pollak et al. (1992) studied this question.
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