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In correlated metals derived from Mott insulators, the motion of an electronis impeded by Coulomb repulsion due to other electrons. This phenomenon causesa substantial reduction in the electron's kinetic energy leading to remarkableexperimental manifestations in optical spectroscopy. The high-Tcsuperconducting cuprates are perhaps the most studied examples of suchcorrelated metals. The occurrence of high-Tc superconductivity in the ironpnictides puts a spotlight on the relevance of correlation effects in thesematerials. Here we present an infrared and optical study on single crystals ofthe iron pnictide superconductor LaFePO. We find clear evidence of electroniccorrelations in metallic LaFePO with the kinetic energy of the electronsreduced to half of that predicted by band theory of nearly free electrons.Hallmarks of strong electronic many-body effects reported here are importantbecause the iron pnictides expose a new pathway towards a correlated electronstate that does not explicitly involve the Mott transition.

Electronic correlations in the iron pnictides