Normal State Correlated Electronic Structure of Iron Pnictides

Authors :: Craco, L.
Laad, M. S.
Leoni, S.
Rosner, H.
Source :: extended version published in Phys. Rev. B 78, 134511 (2008)
Publication Year :: 2008
Abstract: We describe the correlated electronic structure of a prototype Fe-pnictide superconductor, $SmO_{1-x}F_{x}FeAs$, 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.<br />Comment: 4 pages, 3 figures