Ferro-Orbital Order and Strong Magnetic Anisotropy in the Parent Compounds of Iron-Pnictide Superconductors
- 22 December 2009
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 103 (26), 267001
- https://doi.org/10.1103/physrevlett.103.267001
Abstract
The puzzling nature of magnetic and lattice phase transitions of iron pnictides is investigated via a first-principles Wannier function analysis of representative parent compound LaOFeAs. A rare ferro-orbital ordering is found to give rise to the recently observed highly anisotropic magnetic coupling, and drive both phase transitions—without resorting to widely employed frustration or nesting picture. The revealed necessity of the additional orbital physics leads to a correlated electronic structure fundamentally distinct from that of the cuprates. In particular, the strong coupling to the magnons advocates active roles of light orbitons in spin dynamics and electron pairing in iron pnictides.Keywords
Other Versions
This publication has 28 references indexed in Scilit:
- Spin waves and magnetic exchange interactions in CaFe2As2Nature Physics, 2009
- Functional Renormalization-Group Study of the Pairing Symmetry and Pairing Mechanism of the FeAs-Based High-Temperature SuperconductorPhysical Review Letters, 2009
- Unconventional Pairing Originating from the Disconnected Fermi Surfaces of SuperconductingPhysical Review Letters, 2008
- Problems with reconciling density functional theory calculations with experiment in ferropnictidesPhysical Review B, 2008
- Electron-Hole Symmetry and Magnetic Coupling in Antiferromagnetic LaFeAsOPhysical Review Letters, 2008
- Competing orders and spin-density-wave instability in La(O 1−x F x )FeAsEurophysics Letters, 2008
- Minimal two-band model of the superconducting iron oxypnictidesPhysical Review B, 2008
- Magnetic order close to superconductivity in the iron-based layered LaO1-xF x FeAs systemsNature, 2008
- Iron-Based Layered Superconductor La[O1-xFx]FeAs (x = 0.05−0.12) with Tc = 26 KJournal of the American Chemical Society, 2008
- Doping a Mott insulator: Physics of high-temperature superconductivityReviews of Modern Physics, 2006