Regensburg 2016 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 43: Correlated Electrons: f-Electron & Heavy Fermion Systems
TT 43.1: Vortrag
Mittwoch, 9. März 2016, 09:30–09:45, H20
Quantitative study of the f-occupation in CeMIn5 and other cerium compounds with hard x-ray core level photo emission — •Martin Sundermann1, Fabio Strigari1, Thomas Willers1, Jonas Weinen2, Yen-Fa Liao3, Ku-Ding Tsuei3, Eric D. Bauer4, John L. Sarrao4, Joe D. Thompson4, Pascal Lejay5, Arata Tanaka6, Liu Hao Tjeng2, and Andrea Severing1 — 1University of Cologne, Cologne, Germany — 2Max Planck Institute for Chemical Physics of Solids, Dresden, Germany — 3National Synchrotron Radiation Research Center, Hsinchu, Taiwan — 4Los Alamos National Laboratory, Los Alamos, US — 5Institut NEEL, CNRS, Grenoble, France — 6Hiroshima University, Higashi-Hiroshima, Japan
Bulk-sensitive hard x-ray photoelectron spectroscopy (HAXPES) data of the Ce3d core levels of the CeMIn5 family with M = Co, Rh, and Ir will be presented. The data analysis combines a full multiplet and configuration interaction model so that the strong plasmons intensities can be corrected for. This way spectral fn weights can be extracted and the configuration interaction model yields quantitative values for the initial state f-occupation of the CeMIn5. The results are compared with HAXPES data of other heavy Ce compounds of very different hybridization strength. A systematic decrease of the hybridization strength Veff from CePd3 to CeRh3B2 to CeRu2Si2 is observed, and it is smallest for the three CeMIn5 compounds. The f-occupation increases in the same sequence and is close to one for the CeMIn5 family.