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We present a combined study of Ni $K$-edge resonant x-ray scattering anddensity functional calculations to probe and distinguish electronically drivenordering and lattice distortions in nickelate heterostructures. We demonstratethat due to the low crystal symmetry, contributions from structural distortionscan contribute significantly to the energy-dependent Bragg peak intensities ofa bond-ordered NdNiO$_3$ reference film. For a LaNiO$_3$-LaAlO$_3$ superlatticethat exhibits magnetic order, we establish a rigorous upper bound on thebond-order parameter. We thus conclusively confirm predictions of a dominantspin density wave order parameter in metallic nickelates with aquasi-two-dimensional electronic structure.

Quantitative determination of bond order and lattice distortions in nickel oxide heterostructures by resonant x-ray scattering