This title appears in the Scientific Report :
2010
Please use the identifier:
http://dx.doi.org/10.1103/PhysRevB.81.054513 in citations.
Please use the identifier: http://hdl.handle.net/2128/10962 in citations.
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
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 e...
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Personal Name(s): | Ishida, H. |
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Liebsch, A. | |
Contributing Institute: |
Quanten-Theorie der Materialien; IFF-1 |
Published in: | Physical Review B Physical review / B, 81 81 (2010 2010) 5 5, S. 054513 054513 |
Imprint: |
College Park, Md.
APS
2010
|
Physical Description: |
054513 |
DOI: |
10.1103/PhysRevB.81.054513 |
Document Type: |
Journal Article |
Research Program: |
Kondensierte Materie |
Series Title: |
Physical Review B
81 |
Subject (ZB): | |
Link: |
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Publikationsportal JuSER |
Please use the identifier: http://hdl.handle.net/2128/10962 in citations.
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. |