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We report the crystal structure of Ba$_2$La$_2$CoTe$_2$O$_{12}$ determined byRietveld analysis using X-ray powder diffraction data. It was found frommagnetic measurements that Ba$_2$La$_2$CoTe$_2$O$_{12}$ can be described as aspin-1\2 triangular-lattice antiferromagnet with easy-plane anisotropy at lowtemperatures. This compound undergoes a magnetic phase transition at $T_{\rmN}\,{=}\,3.26$ K to an ordered state with the $120^{\circ}$ structure. Themagnetization curve exhibits the one-third plateau characteristic oftriangular-lattice quantum antiferromagnets. The antiferromagnetic exchangeinteraction and the $g$ factors parallel and perpendicular to the $c$ axis wereevaluated to be $J/k_{\rm B}\,{=}\,22$ K, $g_{\parallel}\,{=}\,3.5$ and$g_{\perp}\,{=}\,4.5$, respectively.

Quantum magnetic properties of the spin-1/2 triangular-lattice antiferromagnet Ba$_2$La$_2$CoTe$_2$O$_{12}$