Phonon-Drag Part of the Thermoelectric Power in Metals

A formula for the phonon-drag part ${S}_{g}$ of the thermoelectric power in metals is obtained by assuming that the electron scattering processes can be described by a relaxation time $\ensuremath{\tau}(\mathrm{k})$. The formula differs from the simplest variational expression only by having extra factors of $\ensuremath{\tau}$ in numerator and denominator. The signs of the contributions of ${S}_{g}$ and the low-temperature limit are discussed.

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