Low-energy magnons in the altermagnet $α$-MnTe
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arXiv
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866911236712562688 |
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| author | Povarov, K. Yu. Wosnitza, J. Rößler, S. Schmidt, M. Tsirlin, A. A. Zvyagin, S. A. |
| author_facet | Povarov, K. Yu. Wosnitza, J. Rößler, S. Schmidt, M. Tsirlin, A. A. Zvyagin, S. A. |
| contents | We report high-field electron spin resonance studies of the altermagnetic material $α$-MnTe. In magnetic fields applied parallel to the triangular Mn$^{2+}$ layers we observed a single resonance line, corresponding to an antiferromagnetic resonance (AFMR) mode. The resonance fields of this excitation exhibit an isotropic behavior with $g_\mathrm{eff}=2.01$, which is close to the free-electron $g$-factor value and agrees with the absence of orbital momenta for the Mn$^{2+}$ ions. At low temperatures, the AFMR mode is remarkably sharp ($\sim50$ mT for the full width at the half-maximum). This mode exhibits a noticeable broadening with increasing temperature, indicating the enhanced effect of magnon-magnon interactions. Based on this behavior, we estimate the strength of these interactions. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2510_24376 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Low-energy magnons in the altermagnet $α$-MnTe Povarov, K. Yu. Wosnitza, J. Rößler, S. Schmidt, M. Tsirlin, A. A. Zvyagin, S. A. Strongly Correlated Electrons We report high-field electron spin resonance studies of the altermagnetic material $α$-MnTe. In magnetic fields applied parallel to the triangular Mn$^{2+}$ layers we observed a single resonance line, corresponding to an antiferromagnetic resonance (AFMR) mode. The resonance fields of this excitation exhibit an isotropic behavior with $g_\mathrm{eff}=2.01$, which is close to the free-electron $g$-factor value and agrees with the absence of orbital momenta for the Mn$^{2+}$ ions. At low temperatures, the AFMR mode is remarkably sharp ($\sim50$ mT for the full width at the half-maximum). This mode exhibits a noticeable broadening with increasing temperature, indicating the enhanced effect of magnon-magnon interactions. Based on this behavior, we estimate the strength of these interactions. |
| title | Low-energy magnons in the altermagnet $α$-MnTe |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2510.24376 |