Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 34: Correlated Electrons: f-Electron Systems and Heavy Fermions 1

TT 34.2: Vortrag

Mittwoch, 18. März 2020, 09:45–10:00, HSZ 204

Temperature and Momentum Dependences of the Kondo Peak in the Heavy-Fermion System CeRh2Si2 — •Georg Poelchen1, Susanne Schulz1, Monika Güttler1, Max Mende1, Alexander Generalov2, Christoph Geibel3, Cornelius Krellner4, Steffen Danzenbächer1, James W Allen5, Clemens Laubschat1, Yuri Kucherenko6, and Denis V Vyalikh7, 81IFMP, TU Dresden, Germany — 2Max IV Laboratory, Lund, Sweden — 3MPI for Chemical Physics of Solids, Dresden, Germany — 4Kristall- und Materiallabor, Goethe-Universität Frankfurt, Germany — 5Randall Laboratory, University of Michigan, USA — 6Institute for Metal Physics, National Academy of Science, Ukraine — 7DIPC, San Sebastian, Spain — 8IKERBASQUE, Bilbao, Spain

Ultra-violet angle-resolved photoemission spectroscopy (UV-ARPES) was used to explore the temperature dependences of different surface terminations of the antiferromagnetic Kondo lattice CeRh2Si2. Spectra were taken from Ce- and Si-terminated surfaces in a wide temperature range, and reveal characteristic 4f patterns for weakly (surface) and strongly (bulk) hybridized Ce, respectively. Surprisingly, the temperature dependence of the Fermi level peak points to a considerably larger effective Kondo temperature at the surface, likely due to a higher local-moment effective degeneracy.

Further, we derived the k-resolved dispersion of the Kondo peak which is also found to be distinct due to different sets of itinerant bands to which the 4f states couple, highlighting that the Kondo physics vary remarkably between surface and bulk of the Kondo lattice material.

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