We examine the electronic properties of newly discovered "ferroelectric" metal LiOsO3 combining density-functional and dynamical mean-field theories. We show that the material is close to a Mott transition and that electronic correlations can be tuned to engineer a Mott multiferroic state in 1/1 superlattice of LiOsO3 and LiNbO3. We use electronic structure calculations to predict that the (LiOsO3)1/(LiNbO3)1 superlattice is a type-I multiferroic material with a ferrolectric polarization of 41.2~μC cm−2, Curie temperature of 927\,K, and N\'eel temperature of 671\,K. Our results support a route towards high-temperature multiferroics, \emph{i.e.}, driving non-magnetic \emph{polar metals} into correlated insulating magnetic states.
@article{arxiv.1503.01948,
title = {Design of a Mott Multiferroic from a Non-Magnetic Polar Metal},
author = {Danilo Puggioni and Gianluca Giovannetti and Massimo Capone and James M. Rondinelli},
journal= {arXiv preprint arXiv:1503.01948},
year = {2015}
}