Extended Data Fig. 6: Estimation of lattice components on the magnetic Bragg peak positions.

a, Comparison of integrated scattering intensity at all (H, 0, L+1/2) magnetic Bragg peak positions at 140 K after accounting for the A-type AFM structural factor but not the magnetic form factor. b, Integrated intensity at all (H, 0, L+1/2) magnetic Bragg peak positions at 70 K. The orange solid lines in a and b are Fe magnetic form factors discussed in Extended Data Fig. 5. Green dots highlight unexpected Bragg peak positions that deviate from the Fe magnetic form factor (orange lines). White-shaded blue dots indicate Bragg peaks markedly contaminated with aluminium powder ring. c, Comparison between the integrated scattering intensity at all (H, 0, L+1/2) magnetic (blue, green) and superlattice (H+1/2, 0, L+1/2) (orange) Bragg peak positions at 70 K. These are raw data without any correction and, thus, should be the most accurate description of the scattering intensity at both positions. The integrated intensity of the (2, 0, 0.5) peak at 140 K is shown in the solid black circle. The solid green circles indicate anomalous data at (H, 0, 4.5) positions. d, Expanded view of integrated scattering intensity at (H, 0, L+1/2) positions at 70 K (blue, green) and 140 K (purple). The green bars in c and d near 3 Å⁻¹ indicate the estimated lattice component at (2, 0, 0.5), if present, compared with the intensity gain between 70 K and 140 K shown in the dashed yellow lines.