Electronic correlations in the iron pnictides

被引：4

作者：

Qazilbash M.M. ^{[1
]}

Hamlin J.J. ^{[1
,2
]}

Baumbach R.E. ^{[1
,2
]}

Zhang L. ^{[3
]}

Singh D.J. ^{[3
]}

Maple M.B. ^{[1
,2
]}

Basov D.N. ^{[1
]}

机构：

[1] Department of Physics, University of California, San Diego, San Diego

[2] Institute for Pure and Applied Physical Sciences, University of California, San Diego, San Diego

[3] Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge

来源：

Nature Physics | 2009年 / 5卷 / 09期

基金：

美国国家科学基金会;

关键词：

All Open Access; Bronze;

D O I：

10.1038/nphys1343

中图分类号：

学科分类号：

摘要：

In correlated metals derived from Mott insulators, the motion of an electron is impeded by Coulomb repulsion due to other electrons. This phenomenon causes a substantial reduction in the electrons kinetic energy, leading to remarkable experimental manifestations in optical spectroscopy. The high-transition-temperature (Tc) superconducting cuprates are perhaps the most studied examples of such correlated metals. The occurrence of high-Tc superconductivity in the iron pnictides puts a spotlight on the relevance of correlation effects in these materials. Here, we present an infrared and optical study on single crystals of the iron pnictide superconductor LaFePO. We find clear evidence of electronic correlations in metallic LaFePO with the kinetic energy of the electrons reduced to half of that predicted by band theory of nearly free electrons. We deduce that electronic many-body effects are important in the iron pnictides despite the absence of a Mott transition. © 2009 Macmillan Publishers Limited. All rights reserved.

引用

页码：647 / 650

页数：3

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