Direct evidence for cycloidal modulations in the thermal-fluctuation-stabilized spin spiral and skyrmion states of GaV4S8

Reference : Direct evidence for cycloidal modulations in the thermal-fluctuation-stabilized spin ...


	Document type :	Scientific journals : Other
	Discipline(s) :	Physical, chemical, mathematical & earth Sciences : Physics
	Focus Areas :	Physics and Materials Science
	To cite this reference:	http://hdl.handle.net/10993/41164

Title :	Direct evidence for cycloidal modulations in the thermal-fluctuation-stabilized spin spiral and skyrmion states of GaV4S8
Language :	English
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. [> >]
	Bordacs, S. [> >]
Publication date :	2018
Journal title :	PHYSICAL REVIEW B
Volume :	97
Issue/season :	2
Peer reviewed :	Yes (verified by ORBi^lu)
Audience :	International
ISSN :	2469-9950
Abstract :	[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.
Permalink :	http://hdl.handle.net/10993/41164
DOI :	10.1103/PhysRevB.97.020401

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