Small polarons and c-axis transport in highly anisotropic metals

Motivated by the anomalous c-axis transport properties of the quasi two-dimensional metal, Sr2RuO4, and some of its relatives, we have studied the interlayer hopping of single electrons that are coupled strongly to c-axis bosons. We find a c-axis resistivity that reflects the in-plane electronic scattering in the low and very high temperature limits (relative to the characteristic temperature of the boson Tboson). For temperatures near the Tboson, a broad maximum in the resistivity can appear for sufficiently strong electron-boson coupling. This feature may account for the observed 'metallic to non-metallic crossover' seen in these layered oxides, where the boson may be a phonon. (author)