Fermi-liquid, non-Fermi-liquid, and Mott phases in iron pnictides and cuprates
Fermi-liquid, non-Fermi-liquid, and Mott phases in iron pnictides and cuprates
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DOI：
10.1103/physrevb.81.054513
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发表时间：
2010-02-01
影响因子：
3.7
通讯作者：
Liebsch, Ansgar
中科院分区：
文献类型：
--
作者：
Ishida, Hiroshi;Liebsch, Ansgar
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.
