Hybridization in the exotic heavy fermions CeRhSn and CeIr3B2
- Datum
- 04.02.2025
- Zeit
- 15:00 - 16:00
- Sprecher
- Dr. Thomas Böhm
- Zugehörigkeit
- Los Almos National Laboratory / Los Alamos, NM, USA Postdoctoral Research Associate
- Sprache
- en
- Hauptthema
- Materialien
- Host
- Rita Taubert
- Beschreibung
- Hybridization in the exotic heavy fermions CeRhSn and CeIr3B2 We investigated the optical conductivity σ_1 (ω,T) of quantum-critical CeRhSn and quasi one-dimensional CeIr3B2 heavy fermion systems. Pronounced spectral weight transfer occurs at high energies (~0.8 eV) and temperatures (~500 K) and indicates strong hybridization between conduction electrons and Ce 4f electrons. With decreasing temperature, a crossover from single-ion Kondo physics into an anisotropic coherent Kondo state with concomitant mass enhancement was detected. Our experimental results paved the way towards a refined theoretical analysis based on a combination of density functional theory and dynamic mean field theory. We found that local electronic correlations and mixed valency, as defined by the exact occupancy of the 4f state, play a crucial role to reproduce the observed spectroscopic signatures and photoemission results. Since descriptions of reduced dimensionality are by and large limited to T = 0 so far, our theory additionally presents an avenue towards studying the Kondo state in a wide temperature range, beyond the ground state properties.
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Letztmalig verändert: 04.02.2025, 07:37:49
Veranstaltungsort
Leibniz Institut für Festkörper- und Werkstoffforschung Dresden (B3E.26, IFW Dresden)Helmholtzstraße2001069Dresden
- Homepage
- http://www.ifw-dresden.de
Veranstalter
Leibniz Institut für Festkörper- und Werkstoffforschung DresdenHelmholtzstraße2001069Dresden
- Homepage
- http://www.ifw-dresden.de
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