Gapped 1/9 Magnetization Plateau in the Anisotropic Kagome Antiferromagnet Y-kapellasite
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| Main Authors: | , , , , , , , , , , , , , |
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| Format: | Preprint |
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2026
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| author | Chatterjee, Dipranjan Goddard, Paul A. Thomas, Ewan R. P. Zoch, Katharina M. Wu, Hank C. H. Huddart, Benjamin M. Krellner, Cornelius Kermarrec, Edwin Horvatić, Mladen Krämer, Steffen Puphal, Pascal Singleton, John Blundell, Stephen J. Bert, Fabrice |
| author_facet | Chatterjee, Dipranjan Goddard, Paul A. Thomas, Ewan R. P. Zoch, Katharina M. Wu, Hank C. H. Huddart, Benjamin M. Krellner, Cornelius Kermarrec, Edwin Horvatić, Mladen Krämer, Steffen Puphal, Pascal Singleton, John Blundell, Stephen J. Bert, Fabrice |
| contents | Fractional magnetization plateaus provide a sensitive probe of many-body spin states in frustrated quantum magnets, yet their microscopic origin in kagome antiferromagnets remains unresolved. This is particularly true of the mysterious $1/9$ plateau, which is predicted by theory but infrequently observed in experiment. Here, we investigate this problem in the $S = 1/2$ anisotropic kagome antiferromagnet Y-kapellasite, Y$_3$Cu$_9$(OH)$_{19}$Cl$_8$, using pulsed-field magnetization measurements on single crystals and high-field $^{35}$Cl NMR. We identify a hierarchy of field-induced fractional features, including $1/3$ and $1/9$ plateaus, as well as a weaker low-field feature. Analysis of the NMR spectra and the magnetic susceptibility across the $1/9$ plateau demonstrate that it is accompanied by an ordered local spin configuration, a strong suppression of low-energy spin fluctuations and activated behavior, consistent with a gapped fractional state. These features differ from those in the only other material YCu$_3$(OH)$_6$Br$_2$[Br$_{1-y}$(OH)$_y$] in which this plateau is observed, implying a surprising robustness of the $1/9$ state to the details of the underlying magnetism. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_08067 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Gapped 1/9 Magnetization Plateau in the Anisotropic Kagome Antiferromagnet Y-kapellasite Chatterjee, Dipranjan Goddard, Paul A. Thomas, Ewan R. P. Zoch, Katharina M. Wu, Hank C. H. Huddart, Benjamin M. Krellner, Cornelius Kermarrec, Edwin Horvatić, Mladen Krämer, Steffen Puphal, Pascal Singleton, John Blundell, Stephen J. Bert, Fabrice Strongly Correlated Electrons Fractional magnetization plateaus provide a sensitive probe of many-body spin states in frustrated quantum magnets, yet their microscopic origin in kagome antiferromagnets remains unresolved. This is particularly true of the mysterious $1/9$ plateau, which is predicted by theory but infrequently observed in experiment. Here, we investigate this problem in the $S = 1/2$ anisotropic kagome antiferromagnet Y-kapellasite, Y$_3$Cu$_9$(OH)$_{19}$Cl$_8$, using pulsed-field magnetization measurements on single crystals and high-field $^{35}$Cl NMR. We identify a hierarchy of field-induced fractional features, including $1/3$ and $1/9$ plateaus, as well as a weaker low-field feature. Analysis of the NMR spectra and the magnetic susceptibility across the $1/9$ plateau demonstrate that it is accompanied by an ordered local spin configuration, a strong suppression of low-energy spin fluctuations and activated behavior, consistent with a gapped fractional state. These features differ from those in the only other material YCu$_3$(OH)$_6$Br$_2$[Br$_{1-y}$(OH)$_y$] in which this plateau is observed, implying a surprising robustness of the $1/9$ state to the details of the underlying magnetism. |
| title | Gapped 1/9 Magnetization Plateau in the Anisotropic Kagome Antiferromagnet Y-kapellasite |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2605.08067 |