Three-dimensional zigzag correlations in the van der Waals Kitaev magnet RuBr$_3$
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| Main Authors: | , , , , , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866914451024773120 |
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| author | Gretarsson, H. Iwazaki, R. Sato, F. Gotou, H. Francoual, S. Nasu, J. Imai, Y. Ohgushi, K. Chaloupka, J. Keimer, B. Suzuki, H. |
| author_facet | Gretarsson, H. Iwazaki, R. Sato, F. Gotou, H. Francoual, S. Nasu, J. Imai, Y. Ohgushi, K. Chaloupka, J. Keimer, B. Suzuki, H. |
| contents | Ruthenium trihalides Ru$X_3$ ($X$ = Cl, Br, I) provide a tunable platform for Kitaev magnetism in two-dimensional van der Waals materials. Despite their similar crystal structures and zigzag antiferromagnetic order, RuBr$_3$ exhibits a higher Néel temperature ($T_N$) than RuCl$_3$, suggesting their distinct proximity to the Kitaev quantum spin liquid phase. Using Ru $L_3$-edge resonant x-ray scattering, we show that, while the long-range zigzag order in RuBr$_3$ disappears at $T_N$, the zigzag correlations that persist well above $T_N$ show a pronounced spectral weight redistribution along the interlayer direction. These results suggest that the enhanced interlayer magnetic interactions driven by the extended Br 4$p$ orbitals stabilize three-dimensional zigzag correlations in RuBr$_3$. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2604_05346 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Three-dimensional zigzag correlations in the van der Waals Kitaev magnet RuBr$_3$ Gretarsson, H. Iwazaki, R. Sato, F. Gotou, H. Francoual, S. Nasu, J. Imai, Y. Ohgushi, K. Chaloupka, J. Keimer, B. Suzuki, H. Strongly Correlated Electrons Ruthenium trihalides Ru$X_3$ ($X$ = Cl, Br, I) provide a tunable platform for Kitaev magnetism in two-dimensional van der Waals materials. Despite their similar crystal structures and zigzag antiferromagnetic order, RuBr$_3$ exhibits a higher Néel temperature ($T_N$) than RuCl$_3$, suggesting their distinct proximity to the Kitaev quantum spin liquid phase. Using Ru $L_3$-edge resonant x-ray scattering, we show that, while the long-range zigzag order in RuBr$_3$ disappears at $T_N$, the zigzag correlations that persist well above $T_N$ show a pronounced spectral weight redistribution along the interlayer direction. These results suggest that the enhanced interlayer magnetic interactions driven by the extended Br 4$p$ orbitals stabilize three-dimensional zigzag correlations in RuBr$_3$. |
| title | Three-dimensional zigzag correlations in the van der Waals Kitaev magnet RuBr$_3$ |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2604.05346 |