Band ferromagnetism versus collective Kondo state in lattice fermion models
arXiv:cond-mat/9612090 · doi:10.1080/01418639708241142
Abstract
It is becoming widely recognized that, contrary to earlier expectations, the usual one-band Hubbard model does not give an explanation for itinerant ferromagnetism. After reviewing the status of magnetic ordering in the one-band model, we discuss the possibility of ferromagnetism in some recently introduced two-band Hubbard models, and in generalized Anderson lattices. It is argued that these two classes of models are closely related and that it is their common feature that the ferromagnetic phase has to compete with a collective Kondo state.
12 pages (plain tex) Presented at the Graduate School on Strongly Correlated Electron Systems, Debrecen (Hungary), September 1996. To appear in Philosophical Magazine B (1997)
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