Local magnetic anisotropy in BaFe2As2: a polarized inelastic neutron scattering study
Abstract
The anisotropy of the magnetic excitations in BaFe2As2 was studied by polarized inelastic neutron scattering which allows one to separate the components of the magnetic response. Despite the in-plane orientation of the static ordered moment we find the in-plane polarized magnons to exhibit a larger gap than the out-of-plane polarized ones indicating very strong single-ion anisotropy within the layers. It costs more energy to rotate a spin within the orthorhombic a-b plane than rotating it perpendicular to the FeAs layers.
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