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Since several bands cross the Fermi surface of iron-based superconductors, an orbital degree of freedom becomes relevant, and orbital effects have been suggested as an explanation of the strongly anisotropic properties of the undoped parent compounds. We use multi-orbital models and numerical techniques to investigate magnetic and orbital order in the anisotropic antiferromagnetic phase. We find that the orbital
character of the electrons at the Fermi surface is strongly affected by the magnetic order, but is more weakly affected by static orbital order. Moreover, we observe that for parameters most closely describing experimental results, the magnetizations of the orbitals differ far more than their densities. We conclude that the dynamic
interplay between magnetism and orbital order is more important than static orbital-order effects for understanding the undoped iron-based
superconductors.
We use a three-band model modelled the bans of LiFeAs and find that the features unique to these bands substantially affect its magnetic fluctuations and are expected to promote triplet superconductivity. |
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