SKM 2023 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 4: f-Electron Systems and Heavy Fermions I

TT 4.10: Vortrag

Montag, 27. März 2023, 12:00–12:15, HSZ 201

Orbital selective coupling in CeRh₃B₂: co-existence of high Curie and high Kondo temperature — Andrea Amorese^1,2, Philipp Hansmann³, Andrea Marino², Peter Körner¹, Thomas Willers¹, Andrew Walters⁴, Kejin Zhou⁴, Kurt Kummer⁵, Nickolas B. Brooks⁵, Hong-Ji Lin⁶, Chien-Te Chen⁶, Pascal Lejay⁷, Maurits W. Haverkort⁸, Liu Hao Tjeng², and •Andrea Severing¹ — ¹Institute of Physics II, University of Cologne, Germany — ²MPI-CPfS, Dresden, Germany — ³Department of Physics, University of Erlangen-Nürnberg, Germany — ⁴Diamond Light Source, Didcot, UK — ⁵ESRF, Grenoble, France — ⁶NSRRC, Hsinchu, Taiwan — ⁷Institut Neel, CNRS, Grenoble, France — ⁸Institute for Theoretical Physics, Heidelberg University, Germany

CeRh₃B₂ combines seemingly exclusive properties of strong intermediate valence and high temperature ferromagnetism below 116K with strongly reduced magnetic moments. Utilizing recent advances in synchrotron techniques (XAS & RIXS) in combination with ab-initio density functional calculations, we find that the Rh states are irrelevant for the high temperature ferromagnetism and the Kondo effect, and that the crystal-field strength is not sufficiently strong to account for the Ce moment reduction. Instead our investigation reveals that different Ce 4f orbitals contribute differently to the magnetic coupling and the Kondo-type hybridization in CeRh₃B₂. The manifestation of such selective orbital coupling is a new aspect in the world of the strongly correlated 4f intermetallics.