We study the influence of inelastic rare-earth impurity scattering on electron-phonon-mediated superconductivity and mass renormalization in (La1-xPrx)Os4Sb12 compounds. Solving the strong-coupling Eliashberg equations we find that the dominant quadrupolar component of the inelastic scattering on Pr impurities yields an enhancement of the superconducting transition temperature T-c in LaOs4Sb12 and increases monotonically as a function of Pr concentration. The calculated results are in good agreement with the experimentally observed T-c(x) dependence. Our analysis suggests that phonons and quadrupolar excitations cause an attractive electron interaction which results in the formation of Cooper pairs and singlet superconductivity in PrOs4Sb12.
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