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Abstract
An attempt is made to formulate a theoretical approach to electronic transport in disordered materials. The conductivity is expressed in terms of a Green function corresponding to the linearized rate equation and is solved using diagrammatic methods. We find a result similar to that of Movaghar and Shirmacher (1981, J. Phys. C, 14, 859), deduced by a renormalized perturbation expansion. The hopping conductivity and thermopower are examined. For temperature and field‐dependent conductivity, the results are in complete agreement with others reported in the literature.