Article (Scientific journals)
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. et al.
2018In Physical Review. B, 97 (2), p. 020401
Peer reviewed
 

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Abstract :
[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.
Disciplines :
Physics
Author, co-author :
White, J. S.
Butykai, A.
Cubitt, R.
Honecker, Dirk ;  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.
External co-authors :
yes
Language :
English
Title :
Direct evidence for cycloidal modulations in the thermal-fluctuation-stabilized spin spiral and skyrmion states of GaV 4 S 8
Publication date :
2018
Journal title :
Physical Review. B
ISSN :
2469-9950
Publisher :
American Physical Society
Volume :
97
Issue :
2
Pages :
020401
Peer reviewed :
Peer reviewed
Focus Area :
Physics and Materials Science
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