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We use polarized neutron scattering to demonstrate that in-plane spinexcitations in electron doped superconducting BaFe1.904Ni0.096As2 (Tc=19.8 K)change from isotropic to anisotropic in the tetragonal phase well above theantiferromagnetic (AF) ordering and tetragonal-to-orthorhombic latticedistortion temperatures (Tn=Ts=33 K) without an uniaxial pressure. While theanisotropic spin excitations are not sensitive to the AF order andtetragonal-to-orthorhombic lattice distortion, superconductivity inducesfurther anisotropy for spin excitations along the [1,1,0] and [1,-1,0]directions. These results indicate that the spin excitation anisotropy is aprobe of the electronic anisotropy or orbital ordering in the tetragonal phaseof iron pnictides.

Spin excitation anisotropy as a probe of orbital ordering in the paramagnetic tetragonal phase of superconducting BaFe1.904Ni0.096As2