Electronic correlations in the ferroelectric metallic state of LiOsO3
Electronic correlations in the ferroelectric metallic state of LiOsO3
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DOI：
10.1103/physrevb.93.161113
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发表时间：
2016-04-25
影响因子：
3.7
通讯作者：
Lupi, S.
中科院分区：
文献类型：
--
作者：
Lo Vecchio, I.;Giovannetti, G.;Lupi, S.
LiOsO3 最近被确定为第一个明确的“铁电金属”，通过实验实现了 Anderson 和 Blount 的预测 [Phys.莱特牧师。 14, 217 (1965)]。在这篇《快速通讯》中，我们通过红外光谱并辅以密度泛函理论和动态平均场理论计算来研究 LiOsO3 中的金属态。我们的测量和理论计算清楚地表明，LiOsO3 是一种非常糟糕的金属，具有较小的准粒子重量，接近莫特-哈伯德局域化转变。实验与理论之间的一致性使我们能够将光导率的所有相关特征归因于锇原子 t(2g) 流形内的强电子-电子相关性。
LiOsO3 has been recently identified as the first unambiguous "ferroelectric metal," experimentally realizing a prediction by Anderson and Blount [Phys. Rev. Lett. 14, 217 (1965)]. In this Rapid Communication, 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 t(2g) manifold of the osmium atoms.