%0 Journal Article
%A Ishida, H.
%A Liebsch, A.
%T Fermi-liquid, non-Fermi-liquid, and Mott phases in iron pnictides and cuprates
%J Physical review / B
%V 81
%N 5
%@ 1098-0121
%C College Park, Md.
%I APS
%M PreJuSER-12049
%P 054513
%D 2010
%Z A. L. would like to thank Igor Mazin, Luca de' Medici, and Massimo Capone for comments. The work of H. I. is supported by the Grant-in-Aid for Scientific Research (Grant No. 20540191) and by the Nihon University Strategic Projects for Academic Research. A.L.'s calculations were carried out on the Julich Jump computer.
%X The role of Coulomb correlations in the iron pnictide LaFeAsO is studied by generalizing exact diagonalization dynamical mean-field theory to five orbitals. For rotationally invariant Hund's rule coupling a transition from a paramagnetic Fermi-liquid phase to a non-Fermi-liquid metallic phase exhibiting frozen moments is found at moderate Coulomb energies. For Ising-like exchange, this transition occurs at a considerably lower critical Coulomb energy. The correlation-induced scattering rate as a function of doping relative to half filling, i.e., delta=n/5 - 1, where n=6 for the undoped material, is shown to be qualitatively similar to the one in the two-dimensional single-band Hubbard model which is commonly used to study strong correlations in high-T-c cuprates. In this scenario, the parent Mott insulator of LaFeAsO is the half-filled n=5 limit, while the undoped n=6 material corresponds to the critical doping region delta(c) approximate to 0.2 in the cuprates, on the verge between the Fermi-liquid phase of the overdoped region and the non-Fermi-liquid pseudogap phase in the underdoped region.
%K J (WoSType)
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000274998000110
%R 10.1103/PhysRevB.81.054513
%U https://juser.fz-juelich.de/record/12049