NMR study on equilateral triangular lattice antiferromagnet Ba2La2CoTe2O12
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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866914331298365440 |
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| author | Morioka, Keito Goto, Takayuki Watanabe, Masari Kojima, Yuki Kurita, Nobuyuki Tanaka, Hidekazu Iguchi, Satoshi Sasaki, Takahiko |
| author_facet | Morioka, Keito Goto, Takayuki Watanabe, Masari Kojima, Yuki Kurita, Nobuyuki Tanaka, Hidekazu Iguchi, Satoshi Sasaki, Takahiko |
| contents | We report a 139La-NMR study of Ba2La2CoTe2O12, S = 1/2 equilateral triangular-lattice antiferromagnet with easy-plane anisotropy at low temperatures. This compound undergoes a magnetic phase transition at TN = 3.26 K into an ordered state with the 120 degree spin structure. Under magnetic fields above 3T, TN splits into TN1 and TN2, which correspond to the transitions from the paramagnetic phase to the up-up-down (uud) phase and from the uud phase to the triangular coplanar phase, respectively. The NMR spin-lattice relaxation rate 1/T1 exhibits a critical divergence at TN1, indicating the onset of long-range magnetic order. At TN2, the NMR-linewidth measured at 5.4 T exhibits an anomalous decrease, which we attribute to a change in the spin structure from the uud to the triangular coplanar phase. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_14057 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | NMR study on equilateral triangular lattice antiferromagnet Ba2La2CoTe2O12 Morioka, Keito Goto, Takayuki Watanabe, Masari Kojima, Yuki Kurita, Nobuyuki Tanaka, Hidekazu Iguchi, Satoshi Sasaki, Takahiko Statistical Mechanics We report a 139La-NMR study of Ba2La2CoTe2O12, S = 1/2 equilateral triangular-lattice antiferromagnet with easy-plane anisotropy at low temperatures. This compound undergoes a magnetic phase transition at TN = 3.26 K into an ordered state with the 120 degree spin structure. Under magnetic fields above 3T, TN splits into TN1 and TN2, which correspond to the transitions from the paramagnetic phase to the up-up-down (uud) phase and from the uud phase to the triangular coplanar phase, respectively. The NMR spin-lattice relaxation rate 1/T1 exhibits a critical divergence at TN1, indicating the onset of long-range magnetic order. At TN2, the NMR-linewidth measured at 5.4 T exhibits an anomalous decrease, which we attribute to a change in the spin structure from the uud to the triangular coplanar phase. |
| title | NMR study on equilateral triangular lattice antiferromagnet Ba2La2CoTe2O12 |
| topic | Statistical Mechanics |
| url | https://arxiv.org/abs/2602.14057 |