Model for the Magnetic Order and Pairing Channels in Fe Pnictide Superconductors
Abstract
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.
Keywords
Cite
@article{arxiv.0805.0148,
title = {Model for the Magnetic Order and Pairing Channels in Fe Pnictide Superconductors},
author = {M. Daghofer and A. Moreo and J. A. Riera and E. Arrigoni and D. J. Scalapino and E. Dagotto},
journal= {arXiv preprint arXiv:0805.0148},
year = {2010}
}
Comments
4 pages, 4 figures, terminology for pairing symmetries improved, accepted for Phys. Rev. Lett