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We report on {23}Na NMR studies of a honeycomb lattice antiferromagnetNa2Ni2TeO6 by {23}Na nuclear spin-echo techniques. The {23}Na nuclearspin-lattice relaxation rate 1/{23}T_1 exhibits critical divergence near a Neeltemperature T_N = 26 K, a narrow critical region, and a critical exponent w =0.34 in 1/{23}T_1 = a (T/T_N - 1)^{-w} for Na2Ni2TeO6, and T_N = 18 K forNa2(Ni{0.5}Cu{0.5})2TeO6. Although the uniform magnetic susceptibility ofNa2Ni2TeO6 exhibits a broad maximum at 35 K characteristic of low dimensionalspin systems, the NMR results indicate three dimensional critical phenomenonaround the Neel temperature.

{23}Na nuclear spin-lattice relaxation studies of Na2Ni2TeO6