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. 2020 Jun 17;11:3076. doi: 10.1038/s41467-020-16868-4

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 2 — a, b Combined spin wave dispersion relation along high symmetry directions, collected with different incident energies. Shaded regions in a are full-width at half maxima (FWHM) from fits to constant E cuts of the spin wave dispersion, demonstrating broad magnetic excitations along both E and q directions. Green lines in b are fits to the spin wave dispersion in the small q limit, showing the q² dependence of spin wave excitations. Dashed lines in b indicate the Brillouin zone boundaries and vertical color bars illustrate the onset of the continuum. c Simulation of the expected lifetime broadening of spin excitations as they disperse within the continuum compared with the experimental data along the <110> direction. The color bar denotes scattering intensity in arbitrary units with high intensity in red and low scattering intensity in blue. d Damping constants γ from damped harmonic oscillator fits to constant q cuts of spin wave dispersion below 20 meV, collected with E_i = 30 meV at T = 5 K. Solid line is a linear fit to the data. Error bars represent one standard deviation of the data.