@article{oai:ksu.repo.nii.ac.jp:00002363,
 author = {ITOH, Yutaka},
 journal = {Journal of the Physical Society of Japan},
 month = {},
 note = {We report on ²³Na NMR studies of the honeycomb lattice antiferromagnet Na₂Ni₂TeO₆ by ²³Na nuclear spin-echo techniques. The ²³Na nuclear spin–lattice relaxation rate 1=²³T₁ exhibits critical divergence near the Néel temperature T_N = 26K, a narrow critical region, and the critical exponent w = 0.34 in 1/²³T₁ ∝ (T/T_N − 1)^−^ω for Na₂Ni₂TeO₆, and T_N = 18K for Na₂(Ni₀.₅Cu₀.₅)₂TeO₆. Although the uniform magnetic susceptibility of Na₂Ni₂TeO₆ exhibits a broad maximum at 35 K, which is the characteristic of low-dimensional spin systems, the NMR results indicate a threedimensional criticalphenomenon near the Néel temperature.},
 pages = {064714-1--064714-4},
 title = {^2^3Na Nuclear Spin–Lattice Relaxation Studies of Na_2Ni_2TeO_6},
 volume = {84},
 year = {2015}
}