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Figure 4
Longitudinal (θ–2θ) line shapes of both magnetic and charge-diffraction patterns of the lattice (black), CDW (blue) and SDW (red) orders in Cr under pressure, using non-resonant X-ray techniques, adapted from the work by Feng et al. (2015aBB26). The schematic drawing represents locations of diffraction orders in reciprocal space. The sample was prepared in a plate shape with a surface normal along the L direction (0, 0, 1). While most diffraction patterns of interest are within or close to the H–K zone, CDW states are best probed with non-vanishing cross-section for all three domains around (2, 1, 1), which is accessible within our high-pressure cell's construction (a full 70° 2θ range from both sides, Fig. 2[link]). For each pressure, all diffraction intensities are normalized to that of the (2, 0, 0) order. The two (2, 0, 0) order intensities at 1.45 and 1.95 GPa are consistent within 6%. The contrast between X-ray magnetic diffraction data from two pressures indicate a spin-flip transition of the SDW state in Cr from longitudinal to transverse relative to the propagating Q vector. The null intensity of the (δ, 1, 0) order at 1.95 GPa was not measured because of expiring beam time.

IUCrJ
Volume 6| Part 4| July 2019| Pages 507-520
ISSN: 2052-2525
https://doi.org/10.1107/S2052252519007061