Quasiparticle properties of strongly correlated electron systems with itinerant metamagnetic behavior
Max-Planck Institute for Solid State Research, Heisenbergstr. 1, 70569 Stuttgart, Germany
Corresponding author: a firstname.lastname@example.org
Revised: 25 February 2009
Published online: 18 March 2009
A brief account of the zero temperature magnetic response of a system of strongly correlated electrons in strong magnetic field is given in terms of its quasiparticle properties. The scenario is based on the paramagnetic phase of the half-filled Hubbard model, and the calculations are carried out with the dynamical mean field theory (DMFT) together with the numerical renormalization group (NRG). As well known, in a certain parameter regime one finds a magnetic susceptibility which increases with the field strength. Here, we analyze this metamagnetic response based on Fermi liquid parameters, which can be calculated within the DMFT-NRG procedure. The results indicate that the metamagnetic response can be driven by field-induced effective mass enhancement. However, also the contribution due to quasiparticle interactions can play a significant role. We put our results in context with experimental studies of itinerant metamagnetic materials.
PACS: 71.10.Fd – Lattice fermion models / 71.27.+a – Strongly correlated electron systems; heavy fermions / 71.30.+h – Metal-insulator transitions and other electronic transitions / 75.20.-g – Diamagnetism, paramagnetism, and superparamagnetism / 71.10.Ay – Fermi-liquid theory and other phenomenological models
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2009