Ising and spin orders in the iron-based superconductors
Cenke Xu, Markus Müller, Subir Sachdev
DOI 10.1103/PhysRevB.78.020501 · Physical Review B
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Abstract
Motivated by recent neutron scattering experiments, we study the ordering of spins in the iron-based superconductors LaFeAs(O1−xFx), assuming them in proximity to a Mott insulator in the phase diagram. The ground state of the parent system with x=0 is a spin-density wave with ordering wave vector Q⃗=(0,π) or (π,0). Upon raising the temperature, we find that the system restores SU(2) symmetry, while an Ising symmetry remains broken, explaining the experimentally observed lattice distortion to a monoclinic crystal structure. Upon further temperature increase, the spins finally disorder at a second transition. The phase transition driven by doping with charge carriers similarly splits into an O(3) transition and an Ising transition with z=3 at larger doping.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| LaFeAsO1-xFx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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