Magnetic excitations and interactions in the Weyl ferrimagnet NdAlSi
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arXiv
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| Auteurs principaux: | , , , , , , , , , , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866909444030332928 |
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| author | Lygouras, Chris J. Yang, Hung-Yu Yao, Xiaohan Gaudet, Jonathan Hao, Yiqing Cao, Huibo Rodriguez-Rivera, Jose A. Podlesnyak, Andrey Blügel, Stefan Nikolić, Predrag Tafti, Fazel Broholm, Collin L. |
| author_facet | Lygouras, Chris J. Yang, Hung-Yu Yao, Xiaohan Gaudet, Jonathan Hao, Yiqing Cao, Huibo Rodriguez-Rivera, Jose A. Podlesnyak, Andrey Blügel, Stefan Nikolić, Predrag Tafti, Fazel Broholm, Collin L. |
| contents | Weyl fermions can arise from time-reversal symmetry-breaking magnetism, but their impact on magnetic order is a source of ongoing research. Using high-precision neutron diffraction and spectroscopy, we present a comprehensive exploration of the magnetic structure and excitation spectrum of Weyl semimetal and helical magnet NdAlSi. We use Luttinger-Tisza, classical mean-field, and random-phase approximation techniques to model the dispersive crystal field excitons. We find extended-ranged and sign-changing interactions, suggesting a coupling between conduction electrons and the local moments. We demonstrate that low-symmetry anisotropic Dzyaloshinskii-Moriya interactions, in contrast with higher-symmetry interactions enabled by Weyl fermions, play an important role in stabilizing the complex spin spiral ground state of NdAlSi. Our work provides a first detailed view of microscopic interactions in a Weyl magnet, and constrains the role of Weyl electrons and their chirality on the spiral magnetism. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_20743 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Magnetic excitations and interactions in the Weyl ferrimagnet NdAlSi Lygouras, Chris J. Yang, Hung-Yu Yao, Xiaohan Gaudet, Jonathan Hao, Yiqing Cao, Huibo Rodriguez-Rivera, Jose A. Podlesnyak, Andrey Blügel, Stefan Nikolić, Predrag Tafti, Fazel Broholm, Collin L. Strongly Correlated Electrons Weyl fermions can arise from time-reversal symmetry-breaking magnetism, but their impact on magnetic order is a source of ongoing research. Using high-precision neutron diffraction and spectroscopy, we present a comprehensive exploration of the magnetic structure and excitation spectrum of Weyl semimetal and helical magnet NdAlSi. We use Luttinger-Tisza, classical mean-field, and random-phase approximation techniques to model the dispersive crystal field excitons. We find extended-ranged and sign-changing interactions, suggesting a coupling between conduction electrons and the local moments. We demonstrate that low-symmetry anisotropic Dzyaloshinskii-Moriya interactions, in contrast with higher-symmetry interactions enabled by Weyl fermions, play an important role in stabilizing the complex spin spiral ground state of NdAlSi. Our work provides a first detailed view of microscopic interactions in a Weyl magnet, and constrains the role of Weyl electrons and their chirality on the spiral magnetism. |
| title | Magnetic excitations and interactions in the Weyl ferrimagnet NdAlSi |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2412.20743 |