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TT: Fachverband Tiefe Temperaturen

TT 53: Correlated Electrons: Heavy Fermions

TT 53.3: Talk

Thursday, March 14, 2013, 10:00–10:15, H19

Quasiparticles and Fermi surface of UPt₂Si₂ — •Zübeyir Cakir and Gertrud Zwicknagl — Institut für Mathematische Physik, TU Braunschweig, Braunschweig, Germany

U intermetallic compounds exhibit highly complex phase diagrams at low temperatures with unusual and often enigmatic orders. The high sensitivity with respect to variations in external parameters like pressure or magnetic field reflect the strong correlations within the U 5f shell. The present contribution focusses on the tetragonal compound UPt₂Si₂. We calculate the quasi-particle dispersion comparing the results for itinerant and (partially) localized U 5f electrons. The role of the local geometry is emphasized.