We describe the correlated electronic structure of a prototype Fe-pnictide superconductor, SmO1−xFxFeAs, using LDA+DMFT. Strong, multi-orbital electronic correlations generate a low-energy pseudogap in the undistorted phase, giving a bad, incoherent metal in qualitative agreement with observations. Very good semi-quantitative agreement with the experimental spectral functions is seen, and interpreted, within a correlated, multi-orbital picture. Our results show that Fe-pnictides should be understood as low-carrier density, incoherent metals, in resemblance to the underdoped cuprate superconductors.
@article{arxiv.0805.3636,
title = {Normal State Correlated Electronic Structure of Iron Pnictides},
author = {L. Craco and M. S. Laad and S. Leoni and H. Rosner},
journal= {arXiv preprint arXiv:0805.3636},
year = {2009}
}