Orbital Degeneracy and the Microscopic Model of the FeAs Plane in the Iron-Based Superconductors

Details Orbital Degeneracy and the Microscopic Model of the FeAs Plane in the Iron-Based Superconductors Orbital Degeneracy and the Microscopic Model of the FeAs Plane in the Iron-Based Superconductors

2008-04-03

arxiv.org/abs/0804.0536v1

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures

Scientific paper

10.1088/0953-8984/20/42/425203

A microscopic model for the FeAs plane in the newly discovered Iron-based superconductors is proposed with the emphasis on the role of the orbital degeneracy between the Fe $3d_{xz}$ and $3d_{yz}$ orbital in the crystal field environment. The model predicts commensurate antiferromagnetic ordered ground state for the parent compounds and a d-wave superconducting ground state at finite doping. Inter-orbital couplings plays an interesting role in enhancing both orders. Correlated variational wave functions are proposed for both ordered phases.

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