Quasiparticle properties of strongly correlated electron systems with itinerant metamagnetic behavior

TL;DR

This paper investigates the quasiparticle properties of strongly correlated electron systems under strong magnetic fields, revealing how field-induced effective mass enhancement and quasiparticle interactions drive metamagnetic behavior, supported by DMFT-NRG calculations.

Contribution

It provides a detailed analysis of the metamagnetic response in the Hubbard model using DMFT-NRG, highlighting the roles of effective mass and quasiparticle interactions in metamagnetism.

Findings

Metamagnetic response driven by field-induced effective mass enhancement.

Quasiparticle interactions significantly influence the magnetic susceptibility.

Results align with experimental observations of itinerant metamagnetic materials.

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.