Abstract
The small-polaron representation of the electron-phonon Hamiltonian is used. At temperatures lower than half Debye temperature (T<θ/2) the results from the non-polar materials are still valid excepting the fact that the resonance energy is renormalized. AtT<θ/2 the direct absorption is destroyed. The indirect absorption remains but the staying time is determined now by the polaronic hopping. The small-polaron peak appears in a.c. impurity conductivity, too.
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