Importance of Itinerancy and Quantum Fluctuations for the Magnetism in Iron Pnictides

Details Importance of Itinerancy and Quantum Fluctuations for the Magnetism in Iron Pnictides Importance of Itinerancy and Quantum Fluctuations for the Magnetism in Iron Pnictides

2010-05-07

arxiv.org/abs/1005.1170v2

Journal of Physics and Chemistry of Solids 72 (2011) 324--328

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures

Scientific paper

10.1016/j.jpcs.2010.10.005

By applying density functional theory, we find strong evidence for an itinerant nature of magnetism in two families of iron pnictides. Furthermore, by employing dynamical mean field theory with continuous time quantum Monte Carlo as an impurity solver, we observe that the antiferromagnetic metal with small magnetic moment naturally arises out of coupling between unfrustrated and frustrated bands. Our results point to a possible scenario for magnetism in iron pnictides where magnetism originates from a strong instability at the momentum vector ($\pi$, $\pi$, $\pi$) while it is reduced by quantum fluctuations due to the coupling between weakly and strongly frustrated bands.

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