Magneto-orbital coupling in iron pnictides

Abstract

A magneto-orbital coupling mechanism is proposed to account for the weak energy gap at the Fermi energy in the $(\pi ,0)$ ordered SDW state of a realistic three band model for iron pnictides involving $d_{xz}$, $d_{yz}$, and $d_{xy}$ Fe orbitals. The orbital mixing terms between the $d_{xy}$ and $d_{xz}/d_{yz}$ orbitals, which are important in reproducing the orbital composition of the elliptical electron pockets at $(\pm \pi ,0)$ and $(0,\pm \pi )$, are shown to play a key role in the energy gap formation in the SDW state.

12 pages, 4 figures

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