Strong Correlations and Magnetic Frustration in the High Tc Iron Pnictides

Details Strong Correlations and Magnetic Frustration in the High Tc Iron Pnictides Strong Correlations and Magnetic Frustration in the High Tc Iron Pnictides

2008-04-16

arxiv.org/abs/0804.2480v2

Phys. Rev. Lett. 101, 076401 (2008)

Physics

Condensed Matter

Superconductivity

(v2) 4+ pages, 4 figures, discussions on several points expanded; references added. To appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.101.076401

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 Neel 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 $d_{xy}$. A number of existing and future experiments are discussed in light of the theoretical considerations.

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