Abstract
We show that the thermopower of alloys with nonisovalent substitution is described by renormalization due to electron-phonon-impurity interference. The thermopower of high-${\mathit{T}}_{\mathit{c}}$ oxides as well as ordinary metallic alloys is analyzed. For Bi- and Tl-based oxides the observed temperature dependence with a maximum at 100--150 K and subsequent decrease with a sign change results from hole scattering on excess ${\mathrm{O}}^{2\mathrm{\ensuremath{-}}}$ ions. The more complicated situation in Y-Ba-Cu-O is also discussed to explain the strong concentration dependence and different signs of the thermopower along the a and b axes. The electron-phonon coupling constant evaluated from experimental data has a reasonable value: 1--2.5.
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