Figure 1
A sketch of the neutron scattering setup. The wavevectors of the incident and scattered neutrons are, respectively, denoted k0 and k. The angle θ is measured between the applied-field direction H || ez and the scattering vector q = k0 − k ≃ (0, qy, qz); |q| = q = 4πλ−1sinψ, where λ is the average neutron wavelength and 2ψ is the scattering angle. |