Local magnetic anisotropy in BaFe$_2$As$_2$: a polarized inelastic neutron scattering study

Details Local magnetic anisotropy in BaFe$_2$As$_2$: a polarized inelastic neutron scattering study Local magnetic anisotropy in BaFe$_2$As$_2$: a polarized inelastic neutron scattering study

2012-01-11

arxiv.org/abs/1201.2332v1

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures

Scientific paper

The anisotropy of the magnetic excitations in BaFe$_2$As$_2$ 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 {\it a-b} plane than rotating it perpendicular to the FeAs layers.

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