Fig. 1: Sample and wide-angle X-ray diffraction geometry.
From: 3D Heisenberg universality in the van der Waals antiferromagnet NiPS3
a Magnetic unit cell of NiPS3 viewed along the c-axis and X-ray scattering setup schematic showing the orientation of the crystal and copper mount with respect to the beam (shown in red). The scattering plane is parallel to the ab-plane. b Scanning electron micrograph of the edge of the NiPS3 crystal used in the X-ray experiments, viewed from its side profile. The sample is oriented to be viewed along the b-axis in order to locate the optimal location to place the beam to avoid regions where the layers have deformed or delaminated from the bulk crystal. The beam spot size was approximately 8 μm. Inset: the preferred scattering region where the vdW layers exhibit a smooth surface.
