Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2011-06-26
Physics
Condensed Matter
Strongly Correlated Electrons
7 pages, 4 figures, and accepted in Annalen der Physik
Scientific paper
The anisotropic two-orbital Hubbard model with different bandwidths and degrees of frustration in each orbital is investigated in the framework of both single-site dynamical mean-field theory (DMFT) as well as its cluster extension (DCA) for clusters up to four sites combined with a continuous-time quantum Monte Carlo algorithm. This model shows a rich phase diagram which includes the appearance of orbital selective phase transitions, non-Fermi liquid behavior as well as antiferromagnetic metallic states. We discuss the advantages and drawbacks of employing the single-site DMFT with respect to DCA and the consequences for the physical picture obtained out of these calculations. Finally, we argue that such a minimal model may be of relevance to understand the nature of the antiferromagnetic metallic state in the iron-pnictide superconductors as well as the origin of the small staggered magnetization observed in these systems.
Jeschke Harald O.
Lee Hunpyo
Valenti Roser
Zhang Yu-Zhong
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