Saved in:
| Main Authors: | , , , , , , , , , , , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2025
|
| Subjects: | |
| Online Access: | https://arxiv.org/abs/2512.00747 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866912973364133888 |
|---|---|
| author | Zhang, Tingjun Alvarado, Steven J. Gomez Xu, Sijie Hulse, Thomas Williams, Travis J. Wang, Xiaoping He, Junhong Stone, Matthew B. Sarkis, Colin Ye, Feng Liu, Zhaoyu Li, Jinyulin Jayakumar, Aparna Wang, Zehao Xie, Yaofeng Chu, Ching-Wu Deng, Liangzi Morosan, Emilia Yi, Ming Dai, Pengcheng |
| author_facet | Zhang, Tingjun Alvarado, Steven J. Gomez Xu, Sijie Hulse, Thomas Williams, Travis J. Wang, Xiaoping He, Junhong Stone, Matthew B. Sarkis, Colin Ye, Feng Liu, Zhaoyu Li, Jinyulin Jayakumar, Aparna Wang, Zehao Xie, Yaofeng Chu, Ching-Wu Deng, Liangzi Morosan, Emilia Yi, Ming Dai, Pengcheng |
| contents | We use inelastic neutron scattering (INS) and angle-resolved photoemission spectroscopy (ARPES) to study the impact of Li doping on the semiconducting altermagnet $α$-MnTe. Introducing Li results in a spin reorientation from in-plane to out-of-plane direction and increases the density of itinerant carriers. While our ARPES measurements do not indicate any notable doping-induced changes in the electronic band structure or the magnitude of the altermagnetic band splitting, our INS measurements reveal an abrupt carrier-induced decrease in the spin wave lifetime near the zone boundary at high energies. This finding is consistent with a new magnon decay channel driven by doping-induced subtle changes in the band structure and enhanced interactions between Mn$^{2+}$ local moments and itinerant electrons. By extracting the local dynamic susceptibility from INS spectra and applying the total moment sum rule, we find that both undoped and Li-doped $α$-MnTe exhibit the full expected Mn$^{2+}$ local moment of $\approx5.9~μ_\mathrm{B}$ with $S=5/2$. These findings suggest that $α$-MnTe hosts robust local-moment altermagnetism which shows a breakdown at high energies upon addition of itinerant carriers, highlighting the importance of carrier-spin coupling in magneto-transport and spin dynamic properties of altermagnets even in the dilute-carrier limit. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_00747 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Evidence for itinerant electron-local moment interaction in Li-doped $α$-MnTe Zhang, Tingjun Alvarado, Steven J. Gomez Xu, Sijie Hulse, Thomas Williams, Travis J. Wang, Xiaoping He, Junhong Stone, Matthew B. Sarkis, Colin Ye, Feng Liu, Zhaoyu Li, Jinyulin Jayakumar, Aparna Wang, Zehao Xie, Yaofeng Chu, Ching-Wu Deng, Liangzi Morosan, Emilia Yi, Ming Dai, Pengcheng Strongly Correlated Electrons We use inelastic neutron scattering (INS) and angle-resolved photoemission spectroscopy (ARPES) to study the impact of Li doping on the semiconducting altermagnet $α$-MnTe. Introducing Li results in a spin reorientation from in-plane to out-of-plane direction and increases the density of itinerant carriers. While our ARPES measurements do not indicate any notable doping-induced changes in the electronic band structure or the magnitude of the altermagnetic band splitting, our INS measurements reveal an abrupt carrier-induced decrease in the spin wave lifetime near the zone boundary at high energies. This finding is consistent with a new magnon decay channel driven by doping-induced subtle changes in the band structure and enhanced interactions between Mn$^{2+}$ local moments and itinerant electrons. By extracting the local dynamic susceptibility from INS spectra and applying the total moment sum rule, we find that both undoped and Li-doped $α$-MnTe exhibit the full expected Mn$^{2+}$ local moment of $\approx5.9~μ_\mathrm{B}$ with $S=5/2$. These findings suggest that $α$-MnTe hosts robust local-moment altermagnetism which shows a breakdown at high energies upon addition of itinerant carriers, highlighting the importance of carrier-spin coupling in magneto-transport and spin dynamic properties of altermagnets even in the dilute-carrier limit. |
| title | Evidence for itinerant electron-local moment interaction in Li-doped $α$-MnTe |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2512.00747 |