Berlin 2018 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

TT: Fachverband Tiefe Temperaturen

TT 5: f-Electron Systems and Heavy Fermions I

TT 5.9: Vortrag

Montag, 12. März 2018, 12:00–12:15, H 3005

Crystal field scheme of the topologically non-trivial Kondo insulator CeRu₄Sn₆ determined by RIXS — •Andrea Amorese^1,2, Kurt Kummer³, Oliver Stockert², Andrey Prokofiev⁴, Silke Paschen⁴, Maurits Haverkort⁵, and Andrea Severing^1,2 — ¹Institute of Physics II, University of Cologne, Cologne, Germany — ²Max Planck Institute for Chemical Physics of Solids, Dresden, Germany — ³European Synchrotron Radiation Facility (ESRF), Grenoble, France — ⁴Institute of Solid State Physics, Vienna University of Technology, Vienna, Austria — ⁵Institute for Theoretical Physics, Heidelberg University, Heidelberg, Germany

Rare earth Kondo insulators have the potential for being strongly correlated topological insulators and CeRu₄Sn₆ is one of the promising candidates. Unfortunately, in the presence of correlations the models employed for describing the topological insulating properties lack reliability so that information about the electronic structure must be determined experimentally. In particular, the degeneracy of the the Ce³⁺ Hund’s rule ground multiplet is lifted in CeRu₄Sn₆ by the crystal electric field (CEF), but the CEF potential was up to now only partially characterized, due to limitations of the traditional neutron-based techniques. Resonant inelastic soft x-ray scattering (RIXS) has been recently shown to be a very powerful tool to overcome these limitations. With RIXS the ground state and excited Hund’s rule multiplet are accessible and due to the resonant process the electronic excitations are pure and not overshadowed by e.g. phonons. With soft RIXS we have fully determined the CEF scheme of CeRu₄Sn₆.