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Magnetism and Néel skyrmion dynamics in GaV4S8−ySey.

Hicken, T. J. and Holt, S. J. R. and Franke, K. J. A. and Hawkhead, Z. and Štefančič, A. and Wilson, M. N. and Gomilšek, M. and Huddart, B. M. and Clark, S. J. and Lees, M. R. and Pratt, F. L. and Blundell, S. J. and Balakrishnan, G. and Lancaster, T. (2020) 'Magnetism and Néel skyrmion dynamics in GaV4S8−ySey.', Physical review research., 2 (3). 032001.


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.

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Publisher 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.
Date accepted:04 June 2020
Date deposited:09 July 2020
Date of first online publication:01 July 2020
Date first made open access:09 July 2020

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