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Conical spin order with chiral quadrupole helix in CsCuCl₃

Hiroki Ueda1, Elizabeth Skoropata1, Max Burian1, Victor Ukleev1, Gerard Sylvester Perren1, Ludmila Leroy1, Julien Zaccaro1, Urs Staub1*

1 Swiss Light Source, Paul Scherrer Institut, 5232 Villigen-PSI, Switzerland

* Corresponding authors emails: urs.staub@psi.ch
DOI10.24435/materialscloud:mt-xv [version v1]

Publication date: Nov 10, 2022

How to cite this record

Hiroki Ueda, Elizabeth Skoropata, Max Burian, Victor Ukleev, Gerard Sylvester Perren, Ludmila Leroy, Julien Zaccaro, Urs Staub, Conical spin order with chiral quadrupole helix in CsCuCl₃, Materials Cloud Archive 2022.141 (2022), doi: 10.24435/materialscloud:mt-xv.


Here we report a resonant x-ray diffraction (RXD) study at the Cu L₃ edge on the multichiral 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 Cu²⁺.

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Experimental MARVEL H2020

Version history:

2022.141 (version v1) [This version] Nov 10, 2022 DOI10.24435/materialscloud:mt-xv