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

Abstract

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.

arXiv comment4 pages, 4 figures

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Cited by in corpus (4)

• Importance of electronic correlations for structural and magnetic properties of the iron pnictide superconductor LaFeAsO
• Itinerancy enhanced quantum fluctuation of magnetic moments in iron-based superconductors
• Fermi surface and effective masses in photoemission response of the (Ba${}_{1-x}$K${}_x$)Fe${}_2$As${}_2$ superconductor
• Orbital Selective Phase Transition