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TT: Fachverband Tiefe Temperaturen

TT 3: Correlated Electrons: Heavy Fermions

TT 3.11: Talk

Monday, March 26, 2012, 12:15–12:30, H 3005

Fermi surface and magnetic order in UPt₂Si₂ — •Zübeyir Cakir and Gertrud Zwicknagl — Institut f. Mathemat. Physik, TU 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 magnetic-field dependence of the Fermi surface for itinerant and partially localized U 5f-electrons and discuss consequences for field-induced instabilities.