Collinear, incommensurate antiferromagnetism in van der Waals magnet alpha-UTe3
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arXiv
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| Autores principales: | , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866908589209157632 |
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| author | Sakai, H. Tabata, C. Kaneko, K. Tokiwa, Y. Kitazawa, T. Kambe, S. Tokunaga, Y. Haga, Y. |
| author_facet | Sakai, H. Tabata, C. Kaneko, K. Tokiwa, Y. Kitazawa, T. Kambe, S. Tokunaga, Y. Haga, Y. |
| contents | alpha-UTe3, a van der Waals (vdW) actinide compound with a monoclinic ZrSe3-type structure, is a narrow-gap semiconductor with 5f moments. 125Te NMR reveals strongly anisotropic, layer-confined spin fluctuations below about 20 K, with the a-axis component enhanced, and a signal wipeout at the antiferromagnetic (AFM) transition at TN = 5 K. Single-crystal neutron diffraction finds q approx. (0.17, 0.5, 0) and a longitudinal sinusoidal modulation of a-axis moments (amplitude about 0.8 muB) with AFM stacking along b. A CEF singlet-singlet induced-moment framework accounts for the easy-axis anisotropy, the small heat-capacity anomaly at TN, the reduced ordered moment, and the exchange-driven selection of q in this localized 5f vdW magnet, establishing a constrained exchange geometry stabilizing this in-plane incommensurate state. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_10999 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Collinear, incommensurate antiferromagnetism in van der Waals magnet alpha-UTe3 Sakai, H. Tabata, C. Kaneko, K. Tokiwa, Y. Kitazawa, T. Kambe, S. Tokunaga, Y. Haga, Y. Strongly Correlated Electrons alpha-UTe3, a van der Waals (vdW) actinide compound with a monoclinic ZrSe3-type structure, is a narrow-gap semiconductor with 5f moments. 125Te NMR reveals strongly anisotropic, layer-confined spin fluctuations below about 20 K, with the a-axis component enhanced, and a signal wipeout at the antiferromagnetic (AFM) transition at TN = 5 K. Single-crystal neutron diffraction finds q approx. (0.17, 0.5, 0) and a longitudinal sinusoidal modulation of a-axis moments (amplitude about 0.8 muB) with AFM stacking along b. A CEF singlet-singlet induced-moment framework accounts for the easy-axis anisotropy, the small heat-capacity anomaly at TN, the reduced ordered moment, and the exchange-driven selection of q in this localized 5f vdW magnet, establishing a constrained exchange geometry stabilizing this in-plane incommensurate state. |
| title | Collinear, incommensurate antiferromagnetism in van der Waals magnet alpha-UTe3 |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2510.10999 |