Ferroelectricity due to orbital ordering in E-type undoped rare-earth manganites
Strongly Correlated Electrons
2011-02-25 v2
Abstract
Aiming at understanding the origin of the electronic contribution to ferroelectric polarization in undoped manganites, we evaluate the Berry phase of orbital-polarizable Bloch electrons as an orbital ordering (OO) establishes in the background of an antiferromagnetic E-type configuration. The onset of OO is tuned by the Jahn-Teller (JT) interaction in a tight-binding model for interacting electrons moving along zigzag chains. A finite polarization is found as soon as the JT coupling is strong enough to induce OO, supporting the large electronic contribution predicted from first principles.
Keywords
Cite
@article{arxiv.1009.3369,
title = {Ferroelectricity due to orbital ordering in E-type undoped rare-earth manganites},
author = {P. Barone and K. Yamauchi and S. Picozzi},
journal= {arXiv preprint arXiv:1009.3369},
year = {2011}
}
Comments
4 pages, 2 figures, figure and text substantially improved. Title changed