New Type of Charge and Magnetic order in the Ferromagnetic Kondo Lattice

TL;DR

This paper investigates the ferromagnetic Kondo lattice model, revealing a charge-ordered state induced by magnetic polarons due to competing interactions, which is relevant for understanding charge ordering in correlated materials.

Contribution

It introduces a new mechanism for charge ordering driven by magnetic polarons in the ferromagnetic Kondo lattice model, considering Coulomb and superexchange interactions.

Findings

Charge-ordered state induced by magnetic polarons.

Charge order persists even without Coulomb interaction.

Phase diagram mapped for various dopings at zero temperature.

Abstract

We study numerically the one dimensional ferromagnetic Kondo lattice, a model widely used to describe nickel and manganese perovskites. By including a nearest neighbor Coulomb interaction (V) and a superexchange interaction between the localized moments (K), we obtain the phase diagram in parameter space for several dopings at T=0. Due to the competition between double and superexchange, we find a region where the formation of magnetic polarons induces a charge ordered (CO) state which survives also for V=0. This mechanism should be taken into account in theories of charge ordering involving spin degrees of freedom.