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Phys Rev Lett. 2008 Aug 15;101(7):076401. Epub 2008 Aug 13.

Strong correlations and magnetic frustration in the high Tc iron pnictides.

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1
Department of Physics and Astronomy, Rice University, Houston, Texas 77005, USA.

Abstract

We consider the iron pnictides in terms of a proximity to a Mott insulator. The superexchange interactions contain competing nearest-neighbor and next-nearest-neighbor components. In the undoped parent compound, these frustrated interactions lead to a two-sublattice collinear antiferromagnet (each sublattice forming a NĂ©el ordering), with a reduced magnitude for the ordered moment. Electron or hole doping, together with the frustration effect, suppresses the magnetic ordering and allows a superconducting state. The exchange interactions favor a d-wave superconducting order parameter; in the notation appropriate for the Fe square lattice, its orbital symmetry is dxy. A number of existing and future experiments are discussed in light of the theoretical considerations.

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