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The crystal structure and magnetic properties of the spin-1triangular-lattice antiferromagnet Ba$_2$La$_2$NiTe$_2$O$_{12}$ are reported.Its crystal structure is trigonal $R\bar{3}$, which is the same as that ofBa$_2$La$_2$NiW$_2$O$_{12}$ [Y. Doi et al., J. Phys.: Condens. Matter 29,365802 (2017)]. However, the exchange interaction $J/k_{\mathrm{B}}\simeq19$ Kis much greater than that observed in the tungsten system. At zero magneticfield, Ba$_2$La$_2$NiTe$_2$O$_{12}$ undergoes successive magnetic phasetransitions at $T_{\mathrm{N}1}=9.8$ K and $T_{\mathrm{N}2}=8.9$ K. The groundstate is accompanied by a weak ferromagnetic moment. These results indicatethat the ground-state spin structure is a triangular structure in a planeperpendicular to the triangular lattice owing to the small easy-axis-typeanisotropy. The magnetization curve exhibits the one-third plateaucharacteristic of a two-dimensional triangular-lattice Heisenberg-likeantiferromagnet. Exchange constants are also evaluated using density functionaltheory (DFT). The DFT results demonstrate the large difference in the exchangeconstants between tellurium and tungsten systems and the goodtwo-dimensionality of the tellurium system.

Successive phase transitions and quantum magnetization plateau in the spin-1 triangular-lattice antiferromagnet Ba$_2$La$_2$NiTe$_2$O$_{12}$