Mean-field phase diagram of interacting e_g electrons

TL;DR

This paper explores the magnetic phase diagram of a 2D model for e_g electrons in layered nickelates, revealing a tendency towards magnetic order and orbital polarization influenced by crystal fields.

Contribution

It provides a mean-field analysis of the phase diagram, highlighting the role of crystal fields in inducing orbital polarization in e_g electron systems.

Findings

Magnetic order is a common feature in the model.

Orbital polarization is induced by finite crystal fields.

The phase diagram shows a generic tendency towards magnetic order.

Abstract

We investigate the magnetic phase diagram of the two-dimensional model for e_g electrons which describes layered nickelates. One finds a generic tendency towards magnetic order accompanied by orbital polarization. For two equivalent orbitals with diagonal hopping such orbitally polarized phases are induced by finite crystal field.