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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2405.07853 |
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| _version_ | 1866912390469124096 |
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| author | Uykur, E. Tsirlin, A. A. Long, F. Wenzel, M. Dressel, M. Mosina, K. Sofer, Z. Helm, M. Zhou, S. |
| author_facet | Uykur, E. Tsirlin, A. A. Long, F. Wenzel, M. Dressel, M. Mosina, K. Sofer, Z. Helm, M. Zhou, S. |
| contents | We report temperature-dependent reflectivity spectra of the layered van der Waals magnet CrSBr in the far-infrared region. Polarization-dependent measurements resolve the vibrational modes along the E$\|a$- and $b$-axes and reveal the clear structural anisotropy. While the $a$-axis phonons notably harden on cooling, the $b$-axis phonon frequencies are almost temperature-independent. A phonon splitting due to the antiferromagnetic phase transition is observed for the 180~cm$^{-1}$ $a$-axis vibrational mode, accompanied by a phonon softening below $T_N$. Furthermore, an additional mode with strong magnetic characteristics at $\sim$360~cm$^{-1}$ is identified and attributed to the magnon excitation of CrSBr. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_07853 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Phonon and magnon dynamics across antiferromagnetic transition in 2D layered van der Waals material CrSBr Uykur, E. Tsirlin, A. A. Long, F. Wenzel, M. Dressel, M. Mosina, K. Sofer, Z. Helm, M. Zhou, S. Materials Science We report temperature-dependent reflectivity spectra of the layered van der Waals magnet CrSBr in the far-infrared region. Polarization-dependent measurements resolve the vibrational modes along the E$\|a$- and $b$-axes and reveal the clear structural anisotropy. While the $a$-axis phonons notably harden on cooling, the $b$-axis phonon frequencies are almost temperature-independent. A phonon splitting due to the antiferromagnetic phase transition is observed for the 180~cm$^{-1}$ $a$-axis vibrational mode, accompanied by a phonon softening below $T_N$. Furthermore, an additional mode with strong magnetic characteristics at $\sim$360~cm$^{-1}$ is identified and attributed to the magnon excitation of CrSBr. |
| title | Phonon and magnon dynamics across antiferromagnetic transition in 2D layered van der Waals material CrSBr |
| topic | Materials Science |
| url | https://arxiv.org/abs/2405.07853 |