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We use inelastic neutron scattering to study the temperature and energydependence of the spin excitation anisotropy in uniaxial-strainedelectron-doped iron pnictide BaFe$_{1.9}$Ni$_{0.1}$As$_2$ near optimalsuperconductivity ($T_c=20$ K). Our work has been motivated by the observationof in-plane resistivity anisotropy in the paramagnetic tetragonal phase ofelectron-underdoped iron pnictides under uniaxial pressure, which has beenattributed to a spin-driven Ising-nematic state or orbital ordering. Here weshow that the spin excitation anisotropy, a signature of the spin-drivenIsing-nematic phase, exists for energies below $\sim$60 meV inuniaxial-strained BaFe$_{1.9}$Ni$_{0.1}$As$_2$. Since this energy scale isconsiderably larger than the energy splitting of the $d_{xz}$ and $d_{yz}$bands of uniaxial-strained Ba(Fe$_{1-x}$Co$_x$)$_2$As$_2$ near optimalsuperconductivity, spin Ising-nematic correlations is likely the driving forcefor the resistivity anisotropy and associated electronic nematic correlations.

Energy dependence of the spin excitation anisotropy in uniaxial-strained BaFe1.9Ni0.1As2