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The origin of nematic order remains one of the major debates in iron-basedsuperconductors. In theories based on spin nematicity, one major prediction isthat the spin-spin correlation length at (0,$\pi$) should decrease withdecreasing temperature below the structural transition temperature $T_s$. Herewe report inelastic neutron scattering studies on the low-energy spinfluctuations in BaFe$_{1.935}$Ni$_{0.065}$As$_2$ under uniaxial pressure. Bothintensity and spin-spin correlation start to show anisotropic behavior at hightemperature, while the reduction of the spin-spin correlation length at(0,$\pi$) happens just below $T_s$, suggesting strong effect of nematic orderon low-energy spin fluctuations. Our results favor the idea that treats thespin degree of freedom as the driving force of the electronic nematic order.

Effect of nematic order on the low-energy spin fluctuations in detwinned BaFe$_{1.935}$Ni$_{0.065}$As$_2$