Regensburg 2004 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 28: FV-internes Symposium ”Theoretical Modeling of Materials with Correlated Electrons”

TT 28.6: Fachvortrag

Donnerstag, 11. März 2004, 16:30–16:55, H20

Partial localization, dual nature of 5f electrons and heavy fermions in U compounds — •G. Zwicknagl — Institut fuer Mathematische Physik, TU Braunschweig, D-38106 Braunschweig

There is growing evidence that actinide ions may have localized as well as delocalized 5f electrons. These observations form the basis of the dual model which provides a microscopic theory for the heavy quasiparticles in U compounds. In the present talk, I shall present results for the Fermi surface and effective masses in U-based heavy fermion compounds. In addition, I shall show how the dual character of the 5f electrons may arise from the interplay between (effective) hopping and Hund’s rule correlations.