Abstract
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.
| Original language | English |
|---|---|
| Article number | 085110 |
| Journal | Physical Review B |
| Volume | 102 |
| Issue number | 8 |
| DOIs | |
| State | Published - Aug 15 2020 |
| Externally published | Yes |
Funding
We thank Daniel I. Khomskii for useful discussions. Work at the IBS-CCES was supported by the research program of the Institute for Basic Science (IBS-R009-G1). IXS measurements were supported by the RIKEN SPring-8 Center under Proposal No. 20160099. J.-G.P. was partially supported by the Leading Researcher Program of the National Research Foundation of Korea (Grant No. 2020R1A3B2079375).