Dresden 2009 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 19: Correlated Electrons: Metal-Insulator Transition 3
TT 19.5: Vortrag
Dienstag, 24. März 2009, 15:00–15:15, HSZ 301
The local/non-local duality of 5f electrons in actinide compounds: A mean-field study — •Duc-Anh Le1, Sebastien Burdin2, Peter Fulde1, and Gertrud Zwicknagl3 — 1Max Planck Institute for the Physics of Complex Systems, Dresden, Germany — 2Institute of Theoretical Physics, University of Cologne, Germany — 3Institute for Mathematical and Theoretcal Physics, TU Braunschweig, Germany
The local/non-local duality of 5f electrons in actinide compounds has been observed in a great variety of experiments including photo-emission spectroscopy, inelastic neutron scattering, muon spin relaxation measurements, and x-ray inelastic scattering. A general microscopic mechanism leading to the partial localization of 5f orbitals has been proposed within the so-called 'dual model' (D. V. Efremov, et al., Phys. Rev. B 69, 115114 (2004)). It is a generalized multi-orbital Hubbard model which includes the direct Coulomb interaction as well as the Hund's rule correlations. Using a generalized slave boson method (F. Lechermann, et al., Phys. Rev. B 76, 155102 (2007)), we study this model for an electronic filling corresponding to the prototype compound UPt3. We then analyse the calculated phase diagram and discuss the local/non-local and magnetic/non-magnetic phases in terms of orbitally dependent quasi-particle residues and partial electronic occupations.