Fig. 4: Polarised SANS study for phases I, II, III.
a Schematic illustration of the polarised SANS experimental setup. b Schematic indicating non spin-flip (NSF) and spin-flip (SF) magnetic scattering cross-sections. Pi represents the direction of the neutron polarisation, which can be aligned parallel or antiparallel with ki || [001]. The red square denotes the plane containing \(\hat{{{{{{\bf{m}}}}}}}\left({{{{{\bf{Q}}}}}}\right)\). c–g Line-scan profiles showing NSF (black symbols) and SF (red symbols) channels measured in phases I (c) II (d, e) and III (f, g), which are sensitive to the out-of-plane and in-plane components of \(\hat{{{{{{\bf{m}}}}}}}\left({{{{{\bf{Q}}}}}}\right)\), respectively. The insets show schematic illustrations of the overall SANS patterns for phases I, II and III, with the diffraction peak measured in each sub-figure indicated by a circle. Data were obtained in phase I at 2 K and 0.5 T, in phase II at 2 K and 2.6 T, and in phase III at 6 K and 3.0 T. In panels (c–g) error bars indicate the statistical error.
