NMR study of supersolid phases in the triangular-lattice antiferromagnet Na2BaCo(PO4)2
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arXiv
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| Main Authors: | , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866908567696572416 |
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| author | Xu, Xiaoyu Wu, Zhanlong Chen, Ying Huang, Qing Hu, Ze Shi, Xinyu Du, Kefan Li, Shuo Bian, Rui Yu, Rong Cui, Yi Zhou, Haidong Yu, Weiqiang |
| author_facet | Xu, Xiaoyu Wu, Zhanlong Chen, Ying Huang, Qing Hu, Ze Shi, Xinyu Du, Kefan Li, Shuo Bian, Rui Yu, Rong Cui, Yi Zhou, Haidong Yu, Weiqiang |
| contents | We report ultra-low-temperature $^{23}$Na NMR measurements on the Ising triangular lattice antiferromagnet Na$_2$BaCo(PO$_4$)$_2$, which precisely resolve the phase diagram under magnetic field applied along the crystalline $c$ axis. With increasing field, the NMR spectra resolve three ordered phases with distinct spin configurations: the Y, up-up-down (UUD), and V phases. The spin-lattice relaxation rate $1/T_1$ data demonstrate gapless excitations in the Y and V phases, strongly supporting their supersolid nature. However, the phase transitions from the UUD phase to the two supersolid phases exhibit dramatically different behaviors upon cooling. Prior to entering the Y phase, $1/T_1$ identifies a gapless regime within the UUD phase, suggesting a Berezinskii-Kosterlitz-Thouless phase above a second-order phase transition. In contrast, the coexistence of the UUD and V phases observed in our experiments provides direct evidence of a first-order phase transition between these phases. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2504_08570 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | NMR study of supersolid phases in the triangular-lattice antiferromagnet Na2BaCo(PO4)2 Xu, Xiaoyu Wu, Zhanlong Chen, Ying Huang, Qing Hu, Ze Shi, Xinyu Du, Kefan Li, Shuo Bian, Rui Yu, Rong Cui, Yi Zhou, Haidong Yu, Weiqiang Strongly Correlated Electrons We report ultra-low-temperature $^{23}$Na NMR measurements on the Ising triangular lattice antiferromagnet Na$_2$BaCo(PO$_4$)$_2$, which precisely resolve the phase diagram under magnetic field applied along the crystalline $c$ axis. With increasing field, the NMR spectra resolve three ordered phases with distinct spin configurations: the Y, up-up-down (UUD), and V phases. The spin-lattice relaxation rate $1/T_1$ data demonstrate gapless excitations in the Y and V phases, strongly supporting their supersolid nature. However, the phase transitions from the UUD phase to the two supersolid phases exhibit dramatically different behaviors upon cooling. Prior to entering the Y phase, $1/T_1$ identifies a gapless regime within the UUD phase, suggesting a Berezinskii-Kosterlitz-Thouless phase above a second-order phase transition. In contrast, the coexistence of the UUD and V phases observed in our experiments provides direct evidence of a first-order phase transition between these phases. |
| title | NMR study of supersolid phases in the triangular-lattice antiferromagnet Na2BaCo(PO4)2 |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2504.08570 |