2025-09-22 韓国基礎科学研究院（IBS）
Figure 1. (a) Inelastic x-ray scattering (IXS) data evidence the anti-crossing and strong hybridization of phonons and magnons. (b) Fits of the experimental data at some particular momenta. (c) Theoretically calculated dispersion of the hybrid modes and the IXS intensity.
＜関連情報＞
- https://www.ibs.re.kr/cop/bbs/BBSMSTR_000000000738/selectBoardArticle.do?nttId=26143&pageIndex=1&searchCnd=&searchWrd=
- https://journals.aps.org/prl/abstract/10.1103/gymx-jk1g
カゴメ反強磁性体における強いマグノン-フォノン結合 Strong Magnon-Phonon Coupling in the Kagome Antiferromagnets
A. S. Sukhanov, O. I. Utesov, A. N. Korshunov, N. D. Andriushin, M. S. Pavlovskii, S. E. Nikitin, A. A. Kulbakov, K. Manna, C. Felser et al.
Physical Review Letters Published: 21 August, 2025
DOI: https://doi.org/10.1103/gymx-jk1g
Abstract
Magnon-phonon hybridization in ordered materials is a crucial phenomenon with significant implications for spintronics, magnonics, and quantum materials research. We present direct experimental evidence and theoretical insights into magnon-phonon coupling in Mn3Ge, a kagome antiferromagnet with noncollinear spin order. Using inelastic x-ray scattering and ab initio modeling, we uncover strong hybridization between planar spin fluctuations and transverse optical phonons, resulting in a large hybridization gap of ∼2 meV. This coupling is driven by interlayer Heisenberg exchange interactions and is enhanced by the material’s symmetry and magnetic frustration. The simplicity of the Mn3Ge structure enables clear identification of the hybridized modes, bridging theoretical predictions and experimental observations. Our findings establish Mn3Ge as a model system for exploring magnon-phonon interactions and offer a pathway for designing materials with tunable magnetoelastic
