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Article Dans Une Revue Physical Review B Année : 2022

Conical spin order with chiral quadrupole helix in CsCuCl3

Hiroki Ueda
Elizabeth Skoropata
Max Burian
Victor Ukleev
Ludmila Leroy
Julien Zaccaro
Urs Staub

Résumé

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

hal-03740291 , version 1 (29-07-2022)

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Citer

Hiroki Ueda, Elizabeth Skoropata, Max Burian, Victor Ukleev, Gérard Sylvester Perren, et al.. Conical spin order with chiral quadrupole helix in CsCuCl3. Physical Review B, 2022, 105 (14), pp.144408. ⟨10.1103/PhysRevB.105.144408⟩. ⟨hal-03740291⟩

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