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Megahertz dynamics in skyrmion systems probed with muon-spin relaxation
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Hicken, T. J., Wilson, M. N., Franke, K. J. A., Huddart, B. M., Hawkhead, Z., Gomilšek, M., Clark, S. J., Pratt, F. L., Štefančič, A., Hall, A. E., Ciomaga Hatnean, Monica, Balakrishnan, Geetha and Lancaster, T. (2021) Megahertz dynamics in skyrmion systems probed with muon-spin relaxation. Physical Review B, 103 (2). 024428. doi:10.1103/PhysRevB.103.024428 ISSN 2469-9950.
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Official URL: http://dx.doi.org/10.1103/PhysRevB.103.024428
Abstract
We present longitudinal-field muon-spin relaxation (LF μSR) measurements on two systems that stabilize a skyrmion lattice (SkL): Cu2OSeO3, andCoxZnyMn20−x−y for (x, y) = (10, 10), (8, 9), and (8, 8).We find that the SkL phase of Cu2OSeO3 exhibits emergent dynamic behavior at megahertz frequencies, likely due to collective excitations, allowing the SkL to be identified from the μSR response. From measurements following different cooling protocols and calculations of the muon stopping site, we suggest that the metastable SkL is not the majority phase throughout the bulk of this material at the fields and temperatures where it is often observed. The dynamics of bulk Co8Zn9Mn3 are well described by ~2 GHz excitations that reduce in frequency near the critical temperature, while in Co8Zn8Mn4 we observe similar behavior over a wide range of temperatures, implying that dynamics of this kind persist beyond the SkL phase.
| Item Type: | Journal Article | ||||||||||||||||||
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| 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, Electromagnetic waves | ||||||||||||||||||
| Journal or Publication Title: | Physical Review B | ||||||||||||||||||
| Publisher: | American Physical Society | ||||||||||||||||||
| ISSN: | 2469-9950 | ||||||||||||||||||
| Official Date: | 19 January 2021 | ||||||||||||||||||
| Dates: |
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| Volume: | 103 | ||||||||||||||||||
| Number: | 2 | ||||||||||||||||||
| Article Number: | 024428 | ||||||||||||||||||
| DOI: | 10.1103/PhysRevB.103.024428 | ||||||||||||||||||
| Status: | Peer Reviewed | ||||||||||||||||||
| Publication Status: | Published | ||||||||||||||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||||||||||||||
| Copyright Holders: | American Physical Society | ||||||||||||||||||
| Date of first compliant deposit: | 25 January 2021 | ||||||||||||||||||
| Date of first compliant Open Access: | 26 January 2021 | ||||||||||||||||||
| RIOXX Funder/Project Grant: |
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