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

Abstract

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.

4 pages, 3 figures

References in corpus (3)

• Magnetic Order versus superconductivity in the Iron-based layered La(O1-xFx)FeAs systems
• Superconductivity at 43 K in Samarium-arsenide Oxides $SmFeAs{O}_{1-x}{F}_x$
• Superconductivity at 25 K in hole doped $(L{a}_{1-x}S{r}_x)OFeAs$

Cited by in corpus (7)

• Theory of magnetic excitations in iron-based layered superconductors
• Nodal Spin Density Wave and band topology of the FeAs based materials
• Spin-triplet p-wave pairing in a 3-orbital model for iron pnictide superconductors
• Properties of a two orbital model for oxypnictide superconductors: Magnetic order, B_2g spin-singlet pairing channel, and its nodal structure
• Effect of Zn doping on magnetic order and superconductivity in LaFeAsO
• Hidden SDW order and effective low-energy theory for FeAs superconductors
• Magnetic excitations in ferro-pnictide materials controlled by a quantum critical point into hidden order