Thermoelectric power of granular ceramic oxide superconductors

Abstract

We discuss the Seebeck effect or thermoelectric power of granular ceramic oxide superconductors in an effective medium approximation. We compare experimental results to the theory. We find no evidence for attributing the behavior above the critical temperature to any phonon drag. The bump above Tc is simply due to electron-phonon (inelastic) scattering. The sign of the coefficient does not indicate the type of carrier. We show the necessity of theoretical work for compensated semi-metals as well. © 1988