Fig. 2

Fate of the incommensurate order q = (0.574, 0, 0) under an applied field H_b. a The scattering geometry used during this experiment showing the polarization of the incoming X-ray beam (π-polarized) and the direction of the applied magnetic field (along the b—axis). b The two right panels display all the surveyed positions in reciprocal space at H = 0 T (middle panel) and H > H* (right panel). Black dots denote structural peaks, blue dots represent the field-induced commensurate magnetic peaks Ψ_V, green dots represent the incommensurate peaks of Ψ_I, and the red crosses show absent peaks at H > H*. The semicircles represent an inaccessible region below the sample horizon. c Field dependence of the scattering intensity at T = 5 K showing complete suppression at μ ₀ H* = 2.8 T. The inset shows that the q—vector remains constant under an applied magnetic field. d Energy dependence of the scattering intensity at T = 5 K for μ ₀ H = 0 and 4 T. e Temperature dependence at μ ₀ H = 0 T showing the onset of the order parameter at T _I = 38 K. The Gaussian fit to the integrated RMXS intensity gives the χ ² uncertainty shown by the error bars