(1) Max-Planck Institute for Solid State Research, Heisenbergstr. 1, 70569 Stuttgart, Germany
Abstract:
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.