Ferromagnetism in UGe2 : A microscopic model

TL;DR

This paper employs a microscopic Anderson lattice model with a generalized Gutzwiller approach to explain the magnetic and electronic properties of UGe2, capturing its complex ferromagnetic and paramagnetic phases and their evolution under magnetic fields.

Contribution

It introduces a microscopic model that qualitatively reproduces UGe2's magnetic phases and their field-dependent behavior, advancing understanding of heavy fermion ferromagnetism.

Findings

Successfully reproduces magnetic and electronic properties of UGe2

Explains the sequence and evolution of magnetic phases under magnetic field

Highlights the competition between Coulomb interaction and hybridization

Abstract

Anderson lattice model is used to rationalize the principal features of the heavy fermion compound UGe2 by means of the generalized Gutzwiller approach (the SGA method). This microscopic approach successfully reproduces magnetic and electronic properties of this material, in a qualitative agreement with experimental findings from the magnetization measurements, the neutron scattering, and the de Haas-van Alphen oscillations. Most importantly, it explains the appearance, sequence, character, and evolution in an applied magnetic field of the observed in UGe2 ferro- and, para-magnetic phases as an effect of a competition between the f-f electrons Coulomb interaction energy and f-conduction electrons kinetic energy (hybridization)