Phase Separation Induced by Orbital Degrees of Freedom in Models for Manganites with Jahn-Teller Phonons

TL;DR

This study uses Monte Carlo simulations to explore a two-orbital Kondo model with Jahn-Teller phonons, revealing a phase separation driven by orbital degrees of freedom and similarities with manganite experiments.

Contribution

It introduces a novel phase separation regime induced by orbital degrees of freedom in a two-orbital Kondo model with Jahn-Teller phonons.

Findings

Phase diagram includes a new phase separation regime.

Optical conductivity shows similarities with manganite experiments.

Results suggest orbital degrees of freedom significantly influence manganite properties.

Abstract

The two-orbital Kondo model with classical Jahn-Teller phonons is studied using Monte Carlo techniques. The observed phase diagram is rich, and includes a novel regime of phase separation induced by the orbital degrees of freedom. Experimental consequences of our results are discussed. In addition, the optical conductivity $\sigma(\omega)$ of the model is presented. It is shown to have several similarities with experimental measurements for manganites.