Reference : Direct evidence for cycloidal modulations in the thermal-fluctuation-stabilized spin ...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
Physics and Materials Science
Direct evidence for cycloidal modulations in the thermal-fluctuation-stabilized spin spiral and skyrmion states of GaV 4 S 8
White, J. S. [> >]
Butykai, A. [> >]
Cubitt, R. [> >]
Honecker, Dirk mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit]
Dewhurst, C. D. [> >]
Kiss, L. F. [> >]
Tsurkan, V. [> >]
Bordács, S. [> >]
Physical Review B
American Physical Society
[en] We report small-angle neutron scattering studies of the lacunar spinelGaV4S8,which reveal the long-wavelength
magnetic phases to be cycloidally modulated. Upon cooling, these modulated phases, including a recently
proposed Néel-type skyrmion phase, transform into a simple ferromagnetic state. These results indicate the
modulated phases in GaV4S8 gain their stability from thermal fluctuations, while at lower temperatures the
ferromagnetic state emerges in accord with the strong easy-axis magnetic anisotropy. Crucially, our study provides
microscopic evidence that the skyrmions in GaV4S8 indeed display a Néel-type helicity. More generally, our
approach can be applied to evidence the helicity of any bulk skyrmion phase.

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