Fig. 2
Neutron scattering geometry and doping dependence of the magnetic order parameter for NaFe1−xNixAs. a Schematic of [1, 0, 0] × [0, 0, 1] and [1, 0, 1.5] × [0, 1, 0] scattering planes that allow scans of the magnetic Bragg peak Q = (1, 0, 1.5) along (b) [H, 0, 1.5], (c) [1, K, 1.5], and (d) [1, 0, L] directions. Magnetic order parameters measured at Q = (1, 0, 1.5) for NaFe1−xNixAs with (e) x = 0, (f) x = 0.004, (g) x = 0.010, and (h) x = 0.012. No magnetic order is observed for x = 0.015. Data in (e) are from ref.25. All vertical error bars in the figure represent statistical errors of 1 s.d
