Regensburg 2019 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 17: Poster Session: Correlated Electrons 1
TT 17.13: Poster
Montag, 1. April 2019, 15:00–18:30, Poster D
Spin-orbit interaction and quasiparticle bands in locally non-centrosymmetric heavy-fermion systems — •Évrard-Ouicem Eljaouhari1, Gertrud Zwicknagl1, Seunghyun Khim2, Manuel Brando2, and Christoph Geibel2 — 1Institut für Mathematische Physik, TU Braunschweig, Braunschweig, Germany — 2Max Planck Institute for Chemical Physics of Solids, Dresden, Germany
Non-centrosymmetric heavy-fermion materials have gained much interest in the past decade. In these materials, the lack of inversion symmetry in combination with strong spin-orbit interaction and magnetic interactions can lead to novel phenomena. In this poster, we present calculations of the heavy quasiparticle bands of Ce- and Yb-based heavy-fermion compounds from the tetragonal "122"-family. This class of materials comprises compounds with the inversion-symmetric ThCr2Si2 structure as well as systems with the locally non-centrosymmetric CaBe2Ge2 structure. The calculations are performed by means of the Renormalized Band method which proceeds from a Dirac relativistic description of the electronic structure and accounts for Crystalline Electric Field effects and the mass renormalisation due to strong local correlations. We discuss results for YbIr2Si2 which crystallizes in both structures depending on preparation condition. Further on, we present our new results on the new HFS CeRh2As2.