LiOsO3 has been recently identified as the first unambiguous "ferroelectric metal", experimentally realizing a prediction from 1965 by Anderson and Blount. In this work, we investigate the metallic state in LiOsO3 by means of infrared spectroscopy supplemented by Density Functional Theory and Dynamical Mean Field Theory calculations. Our measurements and theoretical calculations clearly show that LiOsO3 is a very bad metal with a small quasiparticle weight, close to a Mott-Hubbard localization transition. The agreement between experiments and theory allows us to ascribe all the relevant features in the optical conductivity to strong electron-electron correlations within the t2g manifold of the osmium atoms.
@article{arxiv.1509.01785,
title = {Electronic correlation assisted ferroelectric metallic state in LiOsO$_3$},
author = {I. Lo Vecchio and G. Giovannetti and M. Autore and P. Di Pietro and A. Perucchi and J. He and K. Yamaura and M. Capone and S. Lupi},
journal= {arXiv preprint arXiv:1509.01785},
year = {2016}
}