Figure 2: In-plane momentum dependence of the magnetic correlations.

(a) Schematic view of the (H,0,L) reciprocal space probed on D7 with the measured trajectory going through (1,0,0.25) in red. The grey area represents the location of the magnetic intensity. r.l.u., reduced lattice units. The green spot represents the location where one observes diffuse scattering around H=0.88 shown in Fig. 4. (b) 3D plot of the magnetic intensity in the SF channel around Q=(1,0,0.25) as a function of temperature and wave vector. (c) Cuts of the 3D map along (H,0,0.25) at three temperatures: 100 K (red squares), 200 K (brown squares) and 300 K (black empty squares). Data obtained in channels X and Z are here averaged. Intensity error bars are statistical error bars calculated by the square root of the measured intensity.