Low magnetization and anisotropy in the antiferromagnetic state of undoped iron pnictides

Details Low magnetization and anisotropy in the antiferromagnetic state of undoped iron pnictides Low magnetization and anisotropy in the antiferromagnetic state of undoped iron pnictides

2010-02-12

arxiv.org/abs/1002.2584v2

Phys. Rev. Lett. 104, 227201 (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 eps figures. Small changes in the text. Modification of colors in Figs. Final version as accepted in PRL

Scientific paper

10.1103/PhysRevLett.104.227201

We examine the magnetic phase diagram of iron pnictides using a five band model. For the intermediate values of the interaction expected to hold in the iron pnictides, we find a metallic low moment state characterized by antiparallel orbital magnetic moments. The anisotropy of the interorbital hopping amplitudes is the key to understanding this low moment state. This state accounts for the small magnetization measured in undoped iron pnictides and leads to the strong exchange anisotropy found in neutron experiments. Orbital ordering is concomitant with magnetism and produces the large zx orbital weight seen at Gamma in photoemission experiments.

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