Direct evidence for cycloidal modulations in the thermal-fluctuation-stabilized spin spiral and skyrmion states of GaV4 S8
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WHITE, Jonathan Stuart; BUTYKAI, Adam; CUBITT, Robert; HONECKER, Dirk; DEWHURST, Charles David; KISS, L.; TSURKAN, Vladimir; BORDACS, Sandor. Direct evidence for cycloidal modulations in the thermal-fluctuation-stabilized spin spiral and skyrmion states of GaV4 S8. In: Physical Review B. 2018, nr. 2(97), p. 0. ISSN -.
10.1103/PhysRevB.97.020401
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Physical Review B
Numărul 2(97) / 2018 / ISSN - /ISSNe 0163-1829

Direct evidence for cycloidal modulations in the thermal-fluctuation-stabilized spin spiral and skyrmion states of GaV4 S8


DOI: 10.1103/PhysRevB.97.020401
Pag. 0-0

White Jonathan Stuart1, Butykai Adam2, Cubitt Robert3, Honecker Dirk3, Dewhurst Charles David3, Kiss L.4, Tsurkan Vladimir56, Bordacs Sandor2
 
1 Paul Scherrer Institute,
2 Budapest University of Technology and Economics, Department of Physics, Budapest,
3 Institut Laue-Langevin, Grenoble,
4 Department of Experimental Solid State Physics, Institute for Solid State Physics and Optics, Wigner-MTA Research Centre for Physics, Budapest,
5 University of Augsburg,
6 Institute of Applied Physics, Academy of Sciences of Moldova
 
Disponibil în IBN: 23 februarie 2018


Rezumat

We report small-angle neutron scattering studies of the lacunar spinel GaV4S8, 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.