Giant intrinsic nonlinear phonon-magnon coupling in the antiferromagnet CoF$_2$
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arXiv
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| Autores principales: | , , , , |
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| Formato: | Preprint |
| Publicado: |
2024
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| Materias: | |
| Acceso en línea: | |
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| _version_ | 1866914793562046464 |
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| author | Prosnikov, M. A. Bal, M. Pisarev, R. V. Christianen, P. C. M. Kalashnikova, A. M. |
| author_facet | Prosnikov, M. A. Bal, M. Pisarev, R. V. Christianen, P. C. M. Kalashnikova, A. M. |
| contents | The observation of strongly coupled lattice and spin dynamics in altermagnet CoF$_2$ is reported. On the background of the expected spin-phonon interaction leading to renormalization of all phonons at the Neel temperature an additional strong coupling between one-magnon excitation and the lowest frequency Raman-active phonon of B1g symmetry was observed and manifested an anomaly in its energy, full width, and intensity at temperature T*=23 K precisely where the frequency of the phonon becomes exactly twice the frequency of the magnon. We assigned this effect to unique magnon-phonon coupling in the form of a two-magnons-one-phonon interaction. The consistent experimental data clearly demonstrate that there is an intrinsic coupling that does not require coherent excitation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_07304 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Giant intrinsic nonlinear phonon-magnon coupling in the antiferromagnet CoF$_2$ Prosnikov, M. A. Bal, M. Pisarev, R. V. Christianen, P. C. M. Kalashnikova, A. M. Materials Science The observation of strongly coupled lattice and spin dynamics in altermagnet CoF$_2$ is reported. On the background of the expected spin-phonon interaction leading to renormalization of all phonons at the Neel temperature an additional strong coupling between one-magnon excitation and the lowest frequency Raman-active phonon of B1g symmetry was observed and manifested an anomaly in its energy, full width, and intensity at temperature T*=23 K precisely where the frequency of the phonon becomes exactly twice the frequency of the magnon. We assigned this effect to unique magnon-phonon coupling in the form of a two-magnons-one-phonon interaction. The consistent experimental data clearly demonstrate that there is an intrinsic coupling that does not require coherent excitation. |
| title | Giant intrinsic nonlinear phonon-magnon coupling in the antiferromagnet CoF$_2$ |
| topic | Materials Science |
| url | https://arxiv.org/abs/2405.07304 |