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
Yes (verified by ORBilu)
[en] We report small-angle neutron scattering studies of the lacunar spinelGaV4S8,which reveal the long-wavelength
<br />magnetic phases to be cycloidally modulated. Upon cooling, these modulated phases, including a recently
<br />proposed Néel-type skyrmion phase, transform into a simple ferromagnetic state. These results indicate the
<br />modulated phases in GaV4S8 gain their stability from thermal fluctuations, while at lower temperatures the
<br />ferromagnetic state emerges in accord with the strong easy-axis magnetic anisotropy. Crucially, our study provides
<br />microscopic evidence that the skyrmions in GaV4S8 indeed display a Néel-type helicity. More generally, our
<br />approach can be applied to evidence the helicity of any bulk skyrmion phase.

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