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Understanding the interplay between nematicity, magnetism andsuperconductivity is pivotal for elucidating the physics of iron-basedsuperconductors. Here we use neutron scattering to probe magnetic and nematicorders throughout the phase diagram of NaFe$_{1-x}$Ni$_x$As, finding that whileboth static antiferromagnetic and nematic orders compete withsuperconductivity, the onset temperatures for these two orders remainwell-separated approaching the putative quantum critical points. We uncoverlocal orthorhombic distortions that persist well above thetetragonal-to-orthorhombic structural transition temperature $T_{\rm s}$ inunderdoped samples and extend well into the overdoped regime that exhibitsneither magnetic nor structural phase transitions. These unexpected localorthorhombic distortions display Curie-Weiss temperature dependence and becomesuppressed below the superconducting transition temperature $T_{\rm c}$,suggesting they result from a large nematic susceptibility near optimalsuperconductivity. Our results account for observations of rotationalsymmetry-breaking above $T_{\rm s}$, and attest to the presence of significantnematic fluctuations near optimal superconductivity.

Local orthorhombic lattice distortions in the paramagnetic tetragonal phase of superconducting NaFe$_{1-x}$Ni$_x$As