Spin-flop-like transition as quantum critical point in Cs$_2$RuO$_4$
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arXiv
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| Auteurs principaux: | , , , , , , , , |
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866911224084561920 |
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| author | Nabi, S. D. Zhu, M. Povarov, K. Yu. Mazzone, D. G. Lass, J. Wu, Y. Yan, Z. Gvasaliya, S. Zheludev, A. |
| author_facet | Nabi, S. D. Zhu, M. Povarov, K. Yu. Mazzone, D. G. Lass, J. Wu, Y. Yan, Z. Gvasaliya, S. Zheludev, A. |
| contents | We report thermodynamic, neutron diffraction, and inelastic neutron scattering measurements on Cs$_2$RuO$_4$, a member of the celebrated family of frustrated magnets Cs$_2$MX$_4$ (M = Cu, Co, X = Br, Cl). Unlike the previously studied members, it is based on $4d$ transition metal ions with $S=1$. Mapping out the $H-T$ magnetic phase diagram reveals an unusual continuous spin-flop-like phase transition associated with a quantum critical point within the antiferromagnetically ordered phase. A quantitative analysis of the complex magnetic excitation spectrum measured in zero field allows us to derive a model magnetic Hamiltonian for this compound. Its main feature is a frustration of magnetic anisotropy on a level that is much higher than in any of the previously studied species. This frustration naturally explains the peculiar phase transition observed. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_19853 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Spin-flop-like transition as quantum critical point in Cs$_2$RuO$_4$ Nabi, S. D. Zhu, M. Povarov, K. Yu. Mazzone, D. G. Lass, J. Wu, Y. Yan, Z. Gvasaliya, S. Zheludev, A. Strongly Correlated Electrons We report thermodynamic, neutron diffraction, and inelastic neutron scattering measurements on Cs$_2$RuO$_4$, a member of the celebrated family of frustrated magnets Cs$_2$MX$_4$ (M = Cu, Co, X = Br, Cl). Unlike the previously studied members, it is based on $4d$ transition metal ions with $S=1$. Mapping out the $H-T$ magnetic phase diagram reveals an unusual continuous spin-flop-like phase transition associated with a quantum critical point within the antiferromagnetically ordered phase. A quantitative analysis of the complex magnetic excitation spectrum measured in zero field allows us to derive a model magnetic Hamiltonian for this compound. Its main feature is a frustration of magnetic anisotropy on a level that is much higher than in any of the previously studied species. This frustration naturally explains the peculiar phase transition observed. |
| title | Spin-flop-like transition as quantum critical point in Cs$_2$RuO$_4$ |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2507.19853 |