Ising and Spin orders in Iron-Based Superconductors

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Ising and Spin orders in Iron-Based Superconductors

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Title: Ising and Spin orders in Iron-Based Superconductors
Author: Xu, Cenke; Mueller, Markus; Sachdev, Subir

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Citation: Xu, Cenke, Markus Mueller, and Subir Sachdev. 2008. Ising and spin orders in iron-based superconductors. Physical Review B 78(2): 020501.
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Abstract: Motivated by recent neutron scattering experiments, we study the ordering of spins in the iron-based superconductors La(O\(_{1-x}\)F\(_x\))FeAs, 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 \(\vec{Q}\) = (0, \(\pi\)) or (\(\pi\), 0). Upon raising the temperature, we find the system to restore 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.
Published Version: doi:10.1103/PhysRevB.78.020501
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