Journal Article

PreJuSER-12049

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Fermi-liquid, non-Fermi-liquid, and Mott phases in iron pnictides and cuprates

Ishida, H. ; Liebsch, A.FZJ*

2010
APS College Park, Md.

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Please use a persistent id in citations: http://hdl.handle.net/2128/10962  doi:10.1103/PhysRevB.81.054513

Abstract: 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.

Keyword(s): J

Note: 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.

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Contributing Institute(s):

1. Quanten-Theorie der Materialien (IFF-1)

Research Program(s):

1. Kondensierte Materie (P54)

Appears in the scientific report 2010

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