Abstract
Based on a phenomenological model with s± pairing symmetry, the mixed-state effect on the low-energy spin dynamics in optimally-doped iron pnictide superconductors is studied by solving Bogoliubov–de Gennes equations. Our results of the spin susceptibility at q=Q in the normal, superconducting and mixed states agree qualitatively with recent neutron scattering experiments. We also propose that the field-induced intensity change in both momentum and real space can be used to further verify the s± pairing symmetry in the iron pnictides.
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