Model for the Magnetic Order and Pairing Channels in Fe Pnictide Superconductors

Details Model for the Magnetic Order and Pairing Channels in Fe Pnictide Superconductors Model for the Magnetic Order and Pairing Channels in Fe Pnictide Superconductors

2008-05-01

arxiv.org/abs/0805.0148v4

Phys. Rev. Lett. 101, 237004 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures, terminology for pairing symmetries improved, accepted for Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.101.237004

A two-orbital model for Fe-pnictide superconductors is investigated using computational techniques on two-dimensional square clusters. The hopping amplitudes are derived from orbital overlap integrals, or by band structure fits, and the spin frustrating effect of the plaquette-diagonal Fe-Fe hopping is remarked. A spin 'striped' state is stable in a broad range of couplings in the undoped regime, in agreement with neutron scattering. Adding two electrons to the undoped ground state of a small cluster, the dominant pairing operators are found. Depending on parameters, two pairing operators were identified: they involve inter-xz-yz orbital combinations forming spin singlets or triplets, transforming according to the B_2g and A_2g representations of the D_4h group, respectively.

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