Regensburg 2025 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 58: f-Electron Systems and Heavy Fermions
TT 58.3: Vortrag
Freitag, 21. März 2025, 12:00–12:15, H31
Anderson impurity model calculations for line shape analyses of core to valence RIXS spectra of Ce Kondo materials — •Michelangelo Tagliavini1, Federico Mazza2, Xinlin Yan2, Andrey Prokofiev2, Kurt Kummer3, Maurits W. Haverkort1, and Silke Paschen2 — 1Institute for Theoretical Physics (ITP), Heidelberg University, Philosophenweg 19, 69120, Heidelberg, Germany — 2Institute of Solid State Physics, Vienna University of Technology, Wiedner Hauptstr. 8-10/138 A 1040 Vienna, Austria — 3European Synchrotron Radiation Facility, 71 Avenue des Martyrs, CS40220, F-38043 Grenoble Cedex 9, France
In rare-earth-containing heavy-fermion compounds, the interaction of continuum electrons with 4f local moments can give rise to a Kondo screened ground state. Crystal-field excited states can be probed using Resonant Inelastic X-ray Scattering (RIXS). Interaction between localized 4f states and continuum electrons transforms the crystal-field excitations into resonances with hybridization-dependent asymmetric line shapes. In this study, we present results for two heavy-fermion compounds: CeBa7Au6Si40 and CeRu4Sn6, which exhibit low (≈1 K) and high (≈ 200 K) Kondo temperatures, respectively. Using density-functional-theory-based Anderson impurity model calculations implemented in Quanty (www.Quanty.org), we link the f-f transition line shapes to the hybridization function in these materials. Our findings reveal a direct relationship between the hybridization function, the Kondo temperature, and the crystal fields, offering new insights into the underlying physics of these complex systems.
Keywords: Resonant Inelastic X-ray Spectroscopy; Kondo Systems; Many Body Computations; Excitons and Resonances; Correlated Electron Systems