Origin of $A$-type antiferromagnetism and chiral split magnons in altermagnetic $α$-MnTe
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arXiv
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866912271820652544 |
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| author | Alaei, Mojtaba Sobieszczyk, Pawel Ptok, Andrzej Rezaei, Nafise Oganov, Artem R. Qaiumzadeh, Alireza |
| author_facet | Alaei, Mojtaba Sobieszczyk, Pawel Ptok, Andrzej Rezaei, Nafise Oganov, Artem R. Qaiumzadeh, Alireza |
| contents | The origin of the $A$-type antiferromagnetic ordering, characterized by ferromagnetic layers coupling antiferromagnetically, in the prototype semiconductor altermagnet $α$-MnTe has been a topic of ongoing debate. Experimentally, $α$-MnTe exhibits an in-plane ferromagnetic exchange interaction, whereas previous \emph{ab initio} calculations predicted an antiferromagnetic interaction. In this paper, we resolve this discrepancy by considering an expanded set of magnetic configurations, which reveals a ferromagnetic in-plane exchange interaction in agreement with experimental findings. Additionally, we demonstrate that the 10th nearest-neighbor exchange interaction is directionally dependent, inducing a nonrelativistic chiral splitting in the magnon bands, as recently observed experimentally. We further show that applying a compressive strain may significantly enhance both nonrelativistic spin and chiral magnon splittings. The strain can also change the sign of the in-plane exchange interaction. Computing magnetic susceptibility, we show that strain enhances the N{é}el temperature, significantly. Our results highlight the critical importance of convergence in the number of magnetic configurations for spin interactions in antiferromagnetic materials. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2411_11985 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Origin of $A$-type antiferromagnetism and chiral split magnons in altermagnetic $α$-MnTe Alaei, Mojtaba Sobieszczyk, Pawel Ptok, Andrzej Rezaei, Nafise Oganov, Artem R. Qaiumzadeh, Alireza Materials Science Mesoscale and Nanoscale Physics The origin of the $A$-type antiferromagnetic ordering, characterized by ferromagnetic layers coupling antiferromagnetically, in the prototype semiconductor altermagnet $α$-MnTe has been a topic of ongoing debate. Experimentally, $α$-MnTe exhibits an in-plane ferromagnetic exchange interaction, whereas previous \emph{ab initio} calculations predicted an antiferromagnetic interaction. In this paper, we resolve this discrepancy by considering an expanded set of magnetic configurations, which reveals a ferromagnetic in-plane exchange interaction in agreement with experimental findings. Additionally, we demonstrate that the 10th nearest-neighbor exchange interaction is directionally dependent, inducing a nonrelativistic chiral splitting in the magnon bands, as recently observed experimentally. We further show that applying a compressive strain may significantly enhance both nonrelativistic spin and chiral magnon splittings. The strain can also change the sign of the in-plane exchange interaction. Computing magnetic susceptibility, we show that strain enhances the N{é}el temperature, significantly. Our results highlight the critical importance of convergence in the number of magnetic configurations for spin interactions in antiferromagnetic materials. |
| title | Origin of $A$-type antiferromagnetism and chiral split magnons in altermagnetic $α$-MnTe |
| topic | Materials Science Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2411.11985 |