Observing Altermagnetism using Polarized Neutrons
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arXiv
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| Format: | Preprint |
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2024
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| _version_ | 1866910649369493504 |
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| author | McClarty, P. A. Gukasov, A. Rau, J. G. |
| author_facet | McClarty, P. A. Gukasov, A. Rau, J. G. |
| contents | Altermagnets are colinear compensated magnets whose magnetic symmetries at zero spin-orbit coupling break spin degeneracy leading to spin-split electronic and magnonic bands that reflect an underlying multipolar order. When there is an approximate $U(1)$ symmetry the magnons in altermagnets are split into equal and opposite chiral pairs. We show that in altermagnets polarized neutrons provide a means to detect the population of time-reversed domains and allow direct measurement of the magnon chirality anisotropy in momentum space -- the central signature of the altermagnetic phase. We demonstrate this response to polarized neutrons in two candidate materials MnF$_2$ and MnTe and show that the presence of these chiralities is stable to small perturbations that break spin-rotation symmetry. This provides a magnonic analogue of spin polarized ARPES that has been used to discern altermagnetism in the electronic band structures of various candidate materials. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2410_10771 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Observing Altermagnetism using Polarized Neutrons McClarty, P. A. Gukasov, A. Rau, J. G. Strongly Correlated Electrons Materials Science Altermagnets are colinear compensated magnets whose magnetic symmetries at zero spin-orbit coupling break spin degeneracy leading to spin-split electronic and magnonic bands that reflect an underlying multipolar order. When there is an approximate $U(1)$ symmetry the magnons in altermagnets are split into equal and opposite chiral pairs. We show that in altermagnets polarized neutrons provide a means to detect the population of time-reversed domains and allow direct measurement of the magnon chirality anisotropy in momentum space -- the central signature of the altermagnetic phase. We demonstrate this response to polarized neutrons in two candidate materials MnF$_2$ and MnTe and show that the presence of these chiralities is stable to small perturbations that break spin-rotation symmetry. This provides a magnonic analogue of spin polarized ARPES that has been used to discern altermagnetism in the electronic band structures of various candidate materials. |
| title | Observing Altermagnetism using Polarized Neutrons |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2410.10771 |