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A brief account of the zero temperature magnetic response of a system ofstrongly correlated electrons in strong magnetic field is given in terms of itsquasiparticle properties. The scenario is based on the paramagnetic phase ofthe half-filled Hubbard model, and the calculations are carried out with thedynamical mean field theory (DMFT) together with the numerical renormalizationgroup (NRG). As well known, in a certain parameter regime one finds a magneticsusceptibility which increases with the field strength. Here, we analyze thismetamagnetic response based on Fermi liquid parameters, which can be calculatedwithin the DMFT-NRG procedure. The results indicate that the metamagneticresponse can be driven by field-induced effective mass enhancement. However,also the contribution due to quasiparticle interactions can play a significantrole. We put our results in context with experimental studies of itinerantmetamagnetic materials.

Quasiparticle properties of strongly correlated electron systems with itinerant metamagnetic behavior