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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 La1−xPrxOs4Sb12 — •Jun Chang1, Ilya Eremin1,2, Peter Thalmeier3, and Peter Fulde11Max-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 (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 Tc in LaOs4Sb12 and increases monotonically as a function of Pr concentration. The calculated results are in good agreement with the experimentally observed Tc (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.

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