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Here we report a resonant x-ray diffraction (RXD) study at the Cu L3 edge onthe multi-chiral system CsCuCl3, exhibiting helical magnetic order in a chiralcrystal structure. RXD is a powerful technique to disentangle electronicdegrees of freedom due to its sensitivity to electric monopoles (charge),magnetic dipoles (spin), and electric quadrupoles (orbital). We characterizeelectric quadrupole moments around Cu ascribed to the unoccupied Cu 3d orbital,whose quantization axis is off the basal plane. Detailed investigation ofmagnetic reflections reveals additional sinusoidal modulations along theprincipal axis superimposed on the reported helical structure, i.e., alongitudinal conical (helical-butterfly) structure. The out-of-planemodulations imply significant spin-orbit interaction despite S = 1/2 of Cu2+.

Conical spin order with chiral quadrupole helix in CsCuCl3