TY  - JOUR
AU  - Ishida, H.
AU  - Liebsch, A.
TI  - Fermi-liquid, non-Fermi-liquid, and Mott phases in iron pnictides and cuprates
JO  - Physical review / B
VL  - 81
IS  - 5
SN  - 1098-0121
CY  - College Park, Md.
PB  - APS
M1  - PreJuSER-12049
SP  - 054513
PY  - 2010
N1  - 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.
AB  - 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.
KW  - J (WoSType)
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000274998000110
DO  - DOI:10.1103/PhysRevB.81.054513
UR  - https://juser.fz-juelich.de/record/12049
ER  -