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arXiv · 1509.01785

Electronic correlation assisted ferroelectric metallic state in LiOsO$_3$

I. Lo Vecchio·G. Giovannetti·M. Autore·P. Di Pietro·A. Perucchi·J. He·K. Yamaura·M. Capone·S. Lupi
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Abstract

LiOsO$_3$ 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 LiOsO$_3$ by means of infrared spectroscopy supplemented by Density Functional Theory and Dynamical Mean Field Theory calculations. Our measurements and theoretical calculations clearly show that LiOsO$_3$ 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 $t_{2g}$ manifold of the osmium atoms.

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I. Lo Vecchio, G. Giovannetti, M. Autore, P. Di Pietro, A. Perucchi, J. He, K. Yamaura, M. Capone, S. Lupi. 2015-09-06. Electronic correlation assisted ferroelectric metallic state in LiOsO$_3$. https://doi.org/10.1103/physrevb.93.161113

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