caa a22 4500 44538171X CHVBK 20180317143019.0 cr unu---uuuuu 170323e20110101xx s 000 0 eng 10.1007/s10948-010-0949-8 doi (NATIONALLICENCE)springer-10.1007/s10948-010-0949-8 Thalmeier P. Max Planck Institute for Chemical Physics of Solids, 01187, Dresden, Germany aut Effect of f Electron Excitations in Heavy Fermion andUnconventional Superconductors [Elektronische Daten] [P. Thalmeier] The low energy crystalline electric field (CEF) excitations of f electrons can play a twofold role in heavy fermion and unconventional superconductors. They may act as a glue for the formation of Cooper pairs and simultaneously as a probe to investigate the symmetry of the order parameter. The former has been found in the skutterudite heavy fermion compound PrOs4Sb12, where a singlet-triplet CEF excitation Δ contributes to the pair formation and enhances T c with respect to L aOs4Sb12. In substituted P r(Os1−x Rux)4Sb12,a continuous increase of Δ leads to a crossing with the local Pr rattling phonon mode and vibronic mode formation caused by magnetoelastic interaction. Furthermore, the T c enhancement turns into a reduction. It is proposed that this signifies a crossover from mainly pair-forming aspherical Coulomb to pair-breaking dipolar exchange scattering with increasing Ru content. In the Ce-based Fe pnictides CEF transitions show anomalous temperature dependence of the line width due to a pronounced feedback effect, which gives direct evidence for the unconventional 3d superconductivity. Springer Science+Business Media, LLC, 2010 Pr skutterudites nationallicence Ce-based Fe pnictides nationallicence CEF excitations nationallicence superconductivity nationallicence Journal of Superconductivity and Novel Magnetism Springer US; http://www.springer-ny.com 24/1-2(2011-01-01), 413-416 1557-1939 24:1-2<413 2011 24 10948 https://doi.org/10.1007/s10948-010-0949-8 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10948-010-0949-8 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Thalmeier P. Max Planck Institute for Chemical Physics of Solids, 01187, Dresden, Germany aut NATIONALLICENCE 773 0- Journal of Superconductivity and Novel Magnetism Springer US; http://www.springer-ny.com 24/1-2(2011-01-01), 413-416 1557-1939 24:1-2<413 2011 24 10948 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer