Stripe Phases in Layered Nickelates

TL;DR

This paper develops an effective Hamiltonian model for layered nickelates that accurately reproduces stripe phases, revealing distinct mechanisms of stripe formation compared to cuprates and manganites.

Contribution

Introduces a new effective Hamiltonian for $e_g$ electrons in layered nickelates that captures stripe phases and highlights different formation mechanisms.

Findings

Model reproduces experimental stripe phases

Stripe formation mechanisms differ from cuprates and manganites

Highlights importance of specific interactions in nickelates

Abstract

To describe quasi two-dimensional nickelates we introduce an effective Hamiltonian for $e_g$ electrons which includes the kinetic energy, on-site Coulomb interactions, spin-spin and Jahn-Teller (static) terms. The experimental stripe phases are correctly reproduced by the model. The mechanisms responsible for stripe formation are different than those reported in cuprates and manganites.