Abstract
In the multiband systems, Hund’s coupling (J) plays a significant role in the spin and charge excitations. We study the dependence of electronic anisotropy on J in terms of Drude weight along different directions as well as the orbital order in the four-fold symmetry broken spin-density wave state of iron pnictides. A robust behavior of the Drude-weight anisotropy within a small window around J∼0.25U with U as intraorbital Coulomb interaction is described in terms of orbital-weight distribution along the reconstructed Fermi surfaces. We also find that the ferro-orbital order increases with J in the widely accepted regime for the latter, which is explained as a consequence of rising exchange field with an increase in magnetization.
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