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Inelastic Neutron-Scattering Measurements of a Three-Dimensional Spin Resonance in the FeAs-Based<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>BaFe</mml:mi><mml:mn>1.9</mml:mn></mml:msub><mml:msub><mml:mi>Ni</mml:mi><mml:mn>0.1</mml:mn></mml:msub><mml:msub><mml:mi>As</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>Superconductor
We use inelastic neutron scattering to study magnetic excitations of the FeAs-based superconductor ${\mathrm{BaFe}}_{1.9}{\mathrm{Ni}}_{0.1}{\mathrm{As}}_{2}$ above and below its ${T}_{c}$ ($=20\text{ }\text{ }\mathrm{K}$). In addition to gradually open a spin gap at the in-plane antiferromagnetic ordering wave vector (1, 0, 0), the effect of superconductivity is to form a three-dimensional resonance …