Unified Model of Ferroelectricity Induced by Spin Order
Abstract
The ferroelectricity of multiferroics induced by spin order is commonly explained by considering either purely electronic or ion-displacement contribution. However, there is no general model which includes both effects simultaneously. Here, we suggest a realistic model to describe the ion-displacement part of the ferroelectricity based on the spin-lattice coupling Hamiltonian. Combining this model with our previous pure electronic model for spin-order induced polarization, we propose a unified model that includes both effects. By applying the unified model to representative multiferroics where the electronic and ion-displacement contributions vary widely, we find that this model can not only reproduce the first-principles results, but also provide insight into the origin of ferroelectricity.
Keywords
Cite
@article{arxiv.1302.1252,
title = {Unified Model of Ferroelectricity Induced by Spin Order},
author = {H. J. Xiang and P. S. Wang and M. -H. Whangbo and X. G. Gong},
journal= {arXiv preprint arXiv:1302.1252},
year = {2014}
}