Berlin 2008 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 36: Superconductivity: Properties, Electronic Structure, Order Parameter

TT 36.7: Talk

Friday, February 29, 2008, 12:00–12:15, H 0104

Eliashberg Theory of Superconductivity and Inelastic Scattering by Rare-Earth Impurities in the Filled Skutterudite La_1−xPr_xOs₄Sb₁₂ — •Jun Chang¹, Ilya Eremin^1,2, Peter Thalmeier³, and Peter Fulde¹ — ¹Max-Planck Institut fur Physik komplexer Systeme, D-01187 Dresden, Germany — ²Institute fur Mathematische und Theoretische Physik, TU-Braunschweig, D-38106 Braunschweig, Germany — ³Max-Planck Institut fur Chemische Physik fester Stoffe, D-01187 Dresden, Germany

We study the influence of inelastic rare-earth impurity scattering on electron-phonon mediated superconductivity and mass renormalization in (La_1−xPr_x)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 the attractive electron interaction which results in the formation of Cooper pairs and singlet superconductivity in PrOs₄Sb₁₂.