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In the skutterudite compounds the anharmonic 'rattling' oscillations of4f-host ions in the surrounding Sb12 cages are found to have significantinfluence on the low temperature properties. Recently specific heat analysis ofPr(Os{1-x}Ru{x})4Sb12 has shown that the energy of crystalline electric field(CEF) singlet-triplet excitations increases strongly with Ru-concentration xand crosses the almost constant rattling mode frequency $\omega_0$ at about x ~0.65. Due to magnetoelastic interactions this may entail prominent nonadiabaticeffects in inelastic neutron scattering (INS) intensity and quadrupolarsusceptibility. Furthermore the Ru- concentration dependence of thesuperconducting Tc, notably the minimum at intermediate x is explained as acrossover effect from pairforming aspherical Coulomb scattering to pairbreakingexchange scattering.

Nonadiabatic effects of rattling phonons and 4f excitations in Pr(Os{1-x}Ru{x})4Sb12