Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

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

TT 34.7: Vortrag

Mittwoch, 18. März 2020, 11:00–11:15, HSZ 204

Orientation of ground-state orbital in CeCoIn5 and CeRhIn5 — •Martin Sundermann1,2, Andrea Amorese1,2, Fabio Strigari1, Brett Leedahl2, Liu Hao Tjeng2, Maurits W. Haverkort3, Hlynur Gretarsson4,2, Hasan Yavaş4, Marco Moretti Sala5, Eric D. Bauer6, Priscila F. S. Rosa6, Joe D. Thompson6, and Andrea Severing1,212. Physikalisches Institut, Universität zu Köln — 2Max Planck Institut für Chemische Physik fester Stoffe, Dresden — 3Institut für Theoretische Physik, Universität Heidelberg — 4PETRA III, Deutsches Elektronen-Synchrotron (DESY), Hamburg — 5European Synchrotron Radiation Facility (ESRF), Grenoble, Frankreich — 6Los Alamos National Laboratory, New Mexico, USA

We present core-level non-resonant inelastic x-ray scattering (NIXS) data of the heavy fermion compounds CeCoIn5 and CeRhIn5 measured at the Ce N4,5-edges. The higher than dipole transitions in NIXS allow determining the orientation of the Γ7 crystal-field ground-state orbital within the unit cell. The crystal-field parameters of the CeMIn5 compounds and related substitution phase diagrams have been investigated in great detail in the past; however, whether the ground-state wave function is the Γ7+ (x2-y2) or Γ7 (xy orientation) remained undetermined. We show that the Γ7 doublet with lobes along the (110) direction forms the ground state in CeCoIn5 and CeRhIn5. A comparison is made to the results of existing DFT+DMFT calculations.

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