Competing Pairing Symmetries in a Generalized Two-Orbital Model for the Pnictides

Details Competing Pairing Symmetries in a Generalized Two-Orbital Model for the Pnictides Competing Pairing Symmetries in a Generalized Two-Orbital Model for the Pnictides

2011-02-07

arxiv.org/abs/1102.1445v2

Phys. Rev. Lett. 106, 217002 (2011)

Physics

Condensed Matter

Superconductivity

submitted PRL 10/5/10

Scientific paper

10.1103/PhysRevLett.106.217002

We introduce and study an extended "t-U-J" two-orbital model for the pnictides that includes Heisenberg terms deduced from the strong coupling expansion. Including these J terms explicitly allows us to enhance the strength of the (pi, 0)-(0, pi) spin order which favors the presence of tightly bound pairing states even in the small clusters that are here exactly diagonalized. The A1g and B2g pairing symmetries are found to compete in the realistic spin-ordered and metallic regime. The dynamical pairing susceptibility additionally unveils low-lying B1g states, suggesting that small changes in parameters may render any of the three channels stable.

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