Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2011-05-23
Phys. Rev. B 84, 174512 (2011)
Physics
Condensed Matter
Strongly Correlated Electrons
10 pages, 9 figures. published version. references added
Scientific paper
10.1103/PhysRevB.84.174512
Recent experimental developments in the iron pnictides have unambiguously demonstrated the existence of in-plane electronic anisotropy in the absence of the long-range magnetic order. Such anisotropy can arise from orbital ordering, which is described by an energy splitting between the two otherwise degenerate $d_{xz}$ and $d_{yz}$ orbitals. By including this phenomenological orbital order into a five-orbital Hubbard model, we obtain the mean-field solutions where the magnetic order is determined self-consistently. Despite sensitivity of the resulting states to the input parameters, we find that a weak orbital order that places the $d_{yz}$ orbital slightly higher in energy than the $d_{xz}$ orbital, combined with intermediate on-site interactions, produces band dispersions that are compatible with the photoemission results. In this regime, the stripe antiferromagnetic order is further stabilized and the resistivity displays the observed anisotropy. We also calculate the optical conductivity and show that it agrees with the temperature evolution of the anisotropy seen experimentally.
Lv Weicheng
Phillips Philip
No associations
LandOfFree
Orbitally and Magnetically Induced Anisotropy in Iron-based Superconductors does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Orbitally and Magnetically Induced Anisotropy in Iron-based Superconductors, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Orbitally and Magnetically Induced Anisotropy in Iron-based Superconductors will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-514448