On the Néel Vector Dependence of X-ray Magnetic Circular Dichroism in Altermagnets
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arXiv
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866912699262173184 |
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| author | Kuneš, Jan |
| author_facet | Kuneš, Jan |
| contents | Dependence of x-ray magnetic circular dichroism on the experimental geometry is described by a frequency-dependent Hall vector. Using group theory, we derive a general relationship between the Hall vector and the orientation of the Néel vector $\bL$ in altermagnets within the free valence spin (FVS) approximation, where the spin-orbit coupling of the valence electrons and their exchange interaction with the core electrons are neglected. For a given spin point group, the full $\bL$-dependence of the Hall vector can be expressed in terms of several irreducible spectral functions. This derivation generalizes earlier results for the special cases of MnTe and MnF$_2$. Depending on the system symmetry, XMCD in the FVS approximation may be present, emerge only when the neglected terms are included, or be completely forbidden. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2508_07234 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | On the Néel Vector Dependence of X-ray Magnetic Circular Dichroism in Altermagnets Kuneš, Jan Materials Science Strongly Correlated Electrons Dependence of x-ray magnetic circular dichroism on the experimental geometry is described by a frequency-dependent Hall vector. Using group theory, we derive a general relationship between the Hall vector and the orientation of the Néel vector $\bL$ in altermagnets within the free valence spin (FVS) approximation, where the spin-orbit coupling of the valence electrons and their exchange interaction with the core electrons are neglected. For a given spin point group, the full $\bL$-dependence of the Hall vector can be expressed in terms of several irreducible spectral functions. This derivation generalizes earlier results for the special cases of MnTe and MnF$_2$. Depending on the system symmetry, XMCD in the FVS approximation may be present, emerge only when the neglected terms are included, or be completely forbidden. |
| title | On the Néel Vector Dependence of X-ray Magnetic Circular Dichroism in Altermagnets |
| topic | Materials Science Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2508.07234 |