Interplay of orbital and spin ordering in the iron pnictides

Details Interplay of orbital and spin ordering in the iron pnictides Interplay of orbital and spin ordering in the iron pnictides

2011-04-10

arxiv.org/abs/1104.1747v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 1 figure

Scientific paper

A number of recent experiments exhibit electronic anisotropy in the iron pnictides, and there is a growing body of experimental evidence that its origin is related to orbital ordering in Fe d_{xz} and d_{yz} orbitals. We examine this problem in the parent compounds of the iron pnictides by a combination of ab initio band theory calculations, phenomenological Ginzburg-Landau theory of coupled orbital and magnetic order parameters, and a microscopic mean-field study of the Kugel-Khomskii model. We find that orbital ordering is sufficient to explain a number of key experimental observations, in particular a linear correlation between the orthorhombic lattice distortion and the magnetic ordered moment. We predict that orbital polarization should scale as a square of magnetic moment close to T_N. Mediated by orbital polarization, the effective spin-spin exchange interactions develop anisotropy in the ab-plane, in accord with recent neutron scattering measurements.

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