Discovery of BKT correlations in the quantum kagome compound Cs$_2$Cu$_3$SnF$_{12}$
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arXiv
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| Autores principales: | , , , , |
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| Formato: | Preprint |
| Publicado: |
2026
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| _version_ | 1866908907350261760 |
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| author | Grbić, M. S. Jakovac, I. Kupčić, I. Tanaka, H. Horvatić, M. |
| author_facet | Grbić, M. S. Jakovac, I. Kupčić, I. Tanaka, H. Horvatić, M. |
| contents | We investigate the microscopic properties of the kagome compound Cs$_2$Cu$_3$SnF$_{12}$ using $^{63,65}$Cu nuclear quadrupolar resonance (NQR). Analysis of the local hyperfine fields below the Néel temperature $T_N = 20$ K indicates a spin structure consistent with $P2_1/n$ symmetry of negative vector chirality. Measurements of the spin-lattice relaxation rate $T_1 ^{-1}$ reveal signatures of a gapless ground state and two-dimensional Berezinskii-Kosterlitz-Thouless (BKT)-type correlations above $T_N$, extending over a broad temperature range of approximately 130 K in zero magnetic field. Within the same temperature range, the observed increase in the NQR linewidth is consistent with short-range chiral order recently identified by neutron scattering. Our results establish Cs$_2$Cu$_3$SnF$_{12}$ as a unique quantum kagome system exhibiting BKT behavior. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_22481 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Discovery of BKT correlations in the quantum kagome compound Cs$_2$Cu$_3$SnF$_{12}$ Grbić, M. S. Jakovac, I. Kupčić, I. Tanaka, H. Horvatić, M. Strongly Correlated Electrons We investigate the microscopic properties of the kagome compound Cs$_2$Cu$_3$SnF$_{12}$ using $^{63,65}$Cu nuclear quadrupolar resonance (NQR). Analysis of the local hyperfine fields below the Néel temperature $T_N = 20$ K indicates a spin structure consistent with $P2_1/n$ symmetry of negative vector chirality. Measurements of the spin-lattice relaxation rate $T_1 ^{-1}$ reveal signatures of a gapless ground state and two-dimensional Berezinskii-Kosterlitz-Thouless (BKT)-type correlations above $T_N$, extending over a broad temperature range of approximately 130 K in zero magnetic field. Within the same temperature range, the observed increase in the NQR linewidth is consistent with short-range chiral order recently identified by neutron scattering. Our results establish Cs$_2$Cu$_3$SnF$_{12}$ as a unique quantum kagome system exhibiting BKT behavior. |
| title | Discovery of BKT correlations in the quantum kagome compound Cs$_2$Cu$_3$SnF$_{12}$ |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2603.22481 |