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Magnetism and Néel skyrmion dynamics in GaV4S8−ySey

Hicken, T.J.; Holt, S.J.R.; Franke, K.J.A.; Hawkhead, Z.; Štefančič, A.; Wilson, M.N.; Gomilšek, M.; Huddart, B.M.; Clark, S.J.; Lees, M.R.; Pratt, F.L.; Blundell, S.J.; Balakrishnan, G.; Lancaster, T.

Magnetism and Néel skyrmion dynamics in GaV4S8−ySey Thumbnail


S.J.R. Holt

K.J.A. Franke

Z. Hawkhead

A. Štefančič

M.N. Wilson

M. Gomilšek

M.R. Lees

F.L. Pratt

S.J. Blundell

G. Balakrishnan


We present an investigation of the influence of low levels of chemical substitution on the magnetic ground state and Néel skyrmion lattice (SkL) state in GaV4S8−ySey, where y=0,0.1,7.9, and 8. Muon-spin spectroscopy (μSR) measurements on y=0 and 0.1 materials reveal the magnetic ground state consists of microscopically coexisting incommensurate cycloidal and ferromagnetic environments, whereas chemical substitution leads to the growth of localized regions of increased spin density. μSR measurements of emergent low-frequency skyrmion dynamics show that the SkL exists under low levels of substitution at both ends of the series. Skyrmionic excitations persist to temperatures below the equilibrium SkL in substituted samples, suggesting the presence of skyrmion precursors over a wide range of temperatures.

Journal Article Type Article
Acceptance Date Jun 4, 2020
Online Publication Date Jul 1, 2020
Publication Date 2020-07
Deposit Date Jul 2, 2020
Publicly Available Date Jul 9, 2020
Journal Physical Review Research
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 2
Issue 3
Article Number 032001
Public URL
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Copyright Statement
Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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