NMR study on equilateral triangular lattice antiferromagnet Ba2La2CoTe2O12

Keito Morioka; Takayuki Goto; Masari Watanabe; Yuki Kojima; Nobuyuki Kurita; Hidekazu Tanaka; Satoshi Iguchi; Takahiko Sasaki

doi:10.1007/s10909-026-03380-0

NMR study on equilateral triangular lattice antiferromagnet Ba2La2CoTe2O12

Statistical Mechanics 2026-02-17 v1

Authors: Keito Morioka , Takayuki Goto , Masari Watanabe , Yuki Kojima , Nobuyuki Kurita , Hidekazu Tanaka , Satoshi Iguchi , Takahiko Sasaki

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Abstract

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.

Keywords

magnetic structure frustrated magnetism magnetic materials and spin systems

Cite

@article{arxiv.2602.14057,
  title  = {NMR study on equilateral triangular lattice antiferromagnet Ba2La2CoTe2O12},
  author = {Keito Morioka and Takayuki Goto and Masari Watanabe and Yuki Kojima and Nobuyuki Kurita and Hidekazu Tanaka and Satoshi Iguchi and Takahiko Sasaki},
  journal= {arXiv preprint arXiv:2602.14057},
  year   = {2026}
}

NMR study on equilateral triangular lattice antiferromagnet Ba2La2CoTe2O12

Abstract

Keywords

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