Magnetoelastic excitations in multiferroic hexagonal YMnO3 studied by inelastic x-ray scattering

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Despite extensive studies, the exact mechanism of magnetoelastic coupling in hexagonal rare-earth manganite RMnO3 still remains under debate. Using inelastic x-ray scattering, we have measured the lattice vibrations of hexagonal manganite RMnO3 over a wide momentum-energy space to identify clear magnetoelastic excitations, which are the long-sought-after direct evidence of the dynamic magnon-phonon coupling. Our calculations using a magnetoelastic coupling model of superexchange striction quantitatively reproduces the experimental observations. Based on these results, we present a broadly applicable method to analyze the mode and momentum dependence of the magnon-phonon coupling for noncollinear magnets.
Publisher
AMER PHYSICAL SOC
Issue Date
2020-08
Language
English
Article Type
Article
Citation

PHYSICAL REVIEW B, v.102, no.8

ISSN
2469-9950
DOI
10.1103/physrevb.102.085110
URI
http://hdl.handle.net/10203/275896
Appears in Collection
PH-Journal Papers(저널논문)
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