Detection of ferroic octupole ordering in $d$-wave altermagnetic rutile-type compounds
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arXiv
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| Autori principali: | , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866915500967067648 |
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| author | Mizumaki, Masaichiro Sasabe, Norimasa Uozumi, Takayuki Oiwa, Rikuto Kusunose, Hiroaki |
| author_facet | Mizumaki, Masaichiro Sasabe, Norimasa Uozumi, Takayuki Oiwa, Rikuto Kusunose, Hiroaki |
| contents | We propose that X-ray absorption and emission magnetic circular dichroism (XAS-MCD and XES-MCD) are promising measurements to directly detect ferroic higher-rank multipoles as candidate order parameters in altermagnets. Using the sum rules for XES-MCD and connecting them to multipole language, we demonstrate that the expectation value of the magnetic octupole moment is finite in the $d$-wave altermagnetic candidate rutile-type compounds TF$_2$ (T=transition metal). We also perform spectral calculations of XAS-MCD and XES-MCD based on an effective model with a full multiplet approach. While the intensity of the XAS-MCD spectra vanishes, the XES-MCD spectra exhibit finite intensity, whose spectrum becomes opposite by inverting the Nèel vector. These results clearly indicate ferroic magnetic octupole order in these compounds. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_14716 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Detection of ferroic octupole ordering in $d$-wave altermagnetic rutile-type compounds Mizumaki, Masaichiro Sasabe, Norimasa Uozumi, Takayuki Oiwa, Rikuto Kusunose, Hiroaki Strongly Correlated Electrons Materials Science We propose that X-ray absorption and emission magnetic circular dichroism (XAS-MCD and XES-MCD) are promising measurements to directly detect ferroic higher-rank multipoles as candidate order parameters in altermagnets. Using the sum rules for XES-MCD and connecting them to multipole language, we demonstrate that the expectation value of the magnetic octupole moment is finite in the $d$-wave altermagnetic candidate rutile-type compounds TF$_2$ (T=transition metal). We also perform spectral calculations of XAS-MCD and XES-MCD based on an effective model with a full multiplet approach. While the intensity of the XAS-MCD spectra vanishes, the XES-MCD spectra exhibit finite intensity, whose spectrum becomes opposite by inverting the Nèel vector. These results clearly indicate ferroic magnetic octupole order in these compounds. |
| title | Detection of ferroic octupole ordering in $d$-wave altermagnetic rutile-type compounds |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2509.14716 |