Dynamical Mean-Field Study of Metamagnetism in Heavy Fermion Systems

TL;DR

This study uses dynamical mean-field theory to analyze how k-dependent c-f mixing and strong correlations influence metamagnetism in heavy fermion systems, aligning with experimental observations in CeRu2Si2.

Contribution

It introduces a detailed DMFT approach to examine the combined effects of k-dependent c-f mixing and Coulomb interactions on metamagnetism in the periodic Anderson model.

Findings

Both k-dependent c-f mixing and Coulomb interactions significantly affect magnetization.

Results are consistent with metamagnetic behavior in CeRu2Si2.

Mass enhancement factors are influenced by strong correlations.

Abstract

We investigate the metamagnetism in the periodic Anderson model with the $\bm{k}$-dependent $c-f$ mixing by using the dynamical mean-field theory combined with the exact diagonalization method. It is found that both effects of the $\bm{k}$-dependent $c-f$ mixing and strong correlation due to the Coulomb interaction between $f$ electrons are significant for determining both the magnetization and the mass enhancement factor. For the case away from the half-filling, the results is consistent with the metamagnetic behavior observed in CeRu$_2$Si$_2$.