Fig. 3: Unraveling the magnetic order of EuCuAs with neutrons and x-rays.
a Powder neutron diffraction (PND). Red and blue tick marks indicate structural and magnetic Bragg peaks. b Resonant elastic X-ray scattering (REXS). The peaks at L = 1.58 and 2.42 are magnetic Bragg peaks. c Single-crystal neutron diffraction (ND). The peaks at L = 0.5 and 1.5 are magnetic Bragg peaks. d Integrated intensity of the Q = (1, 0, 1.5) magnetic reflection measured with ND. e Refinement of single-crystal ND data, comparing the observed and calculated magnetic Bragg peak intensities for the helical structure. f Comparison of observed (\({P}_{ij}^{{{{\rm{obs.}}}}}\)) and calculated (\({P}_{ij}^{{{{\rm{helix}}}}}\)) full polarization matrices for four magnetic reflections. For each reflection, the nine elements of the polarization matrix Pij from left to right correspond to ij = xx, xy, xz, yx, yy, yz, zx, zy and zz. The data were recorded at T = 2 K. g, h Field dependence of peaks observed with REXS and ND, respectively. The error bars correspond to the standard deviation on the integrated intensity of the reflections.
