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Magnetism and Néel skyrmion dynamics in GaV4S8−ySey

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Hicken, T. J., Holt, S. J. R., Franke, K. J. A., Hawkhead, Z., Štefančič, Aleš, Wilson, M. N., Gomilšek, M., Huddart, B. M., Clark, S. J., Lees, Martin R., Pratt, F. L., Blundell, S. J., Balakrishnan, Geetha and Lancaster, T. (2020) Magnetism and Néel skyrmion dynamics in GaV4S8−ySey. Physical Review Research, 2 (3). 032001(R). doi:10.1103/PhysRevResearch.2.032001

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Official URL: http://dx.doi.org/10.1103/PhysRevResearch.2.032001

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Abstract

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.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH): Skyrme model , Muon spin rotation, Lattice dynamics
Journal or Publication Title: Physical Review Research
Publisher: American Physical Society
ISSN: 2643-1564
Official Date: 1 July 2020
Dates:
DateEvent
1 July 2020Published
4 June 2020Accepted
20 May 2020Modified
19 March 2020Submitted
Volume: 2
Number: 3
Article Number: 032001(R)
DOI: 10.1103/PhysRevResearch.2.032001
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Copyright Holders: The Authors
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
EP/N032128/1[EPSRC] Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
Z1-1852Javna Agencija za Raziskovalno Dejavnost RShttp://dx.doi.org/10.13039/501100004329
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