Ferro-Orbital Order and Strong Magnetic Anisotropy in the Parent Compounds of Iron-Pnictide Superconductors - Condensed Matter > SuperconductivityReport as inadecuate




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Abstract: The puzzling nature of magnetic and lattice phase transitions of ironpnictides is investigated via a first-principles Wannier function analysis ofrepresentative parent compound LaOFeAs. A rare ferro-orbital ordering is foundto give rise to the recently observed highly anisotropic magnetic coupling, anddrive the phase transitions-without resorting to widely employed frustrationor nesting picture. The revealed necessity of the additional orbital physicsleads to a correlated electronic structure fundamentally distinct from that ofthe cuprates. In particular, the strong coupling to the magnons advocatesactive roles of light orbitons in spin dynamics and electron pairing in ironpnictides.



Author: Chi-Cheng Lee, Wei-Guo Yin, Wei Ku

Source: https://arxiv.org/



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