Orbital-Ordering Induces Structural Phase Transition and the Resistivity Anomaly in Iron Pnictides

Details Orbital-Ordering Induces Structural Phase Transition and the Resistivity Anomaly in Iron Pnictides Orbital-Ordering Induces Structural Phase Transition and the Resistivity Anomaly in Iron Pnictides

2009-05-11

arxiv.org/abs/0905.1704v2

Phys. Rev. B, vol. 80, 224506 (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

Out of the deep freeze and into the Published domain, orbital ordering meets the iron age

Scientific paper

We attribute the structural phase transition (SPT) in the parent compounds of the iron pnictides to orbital ordering. Due to the anisotropy of the $d_{xz}$ and $d_{yz}$ orbitals in the $xy$ plane, a ferro-orbital ordering makes the orthorhombic structure more energetically favorable, thus inducing the SPT. In this orbital-ordered system, the sites with orbitals that do not order have higher energies. Scattering of the itinerant electrons by these localized two-level systems causes a resistivity anomaly upon the onset of the SPT. The proposed orbital ordering also leads to the stripe-like anti-ferromagnetism and anisotropy of the magnetic exchanges. This model is quantitatively consistent with available experimental observations.

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