Successive phase transitions and magnetization plateau in the spin-1 triangular-lattice antiferromagnet ${\rm Ba}_{2}{\rm La}_{2}{\rm NiTe}_{2}{\rm O}_{12}$ with small easy-axis anisotropy

Mutsuki Saito,1,* Masari Watanabe,1 Nobuyuki Kurita,1 Akira Matsuo,2 Koichi Kindo,2 Maxim Avdeev,3,4 Harald O. Jeschke,5 and Hidekazu Tanaka1,† 1Department of Physics, Tokyo Institute of Technology, Meguro-ku, Tokyo 152-8551, Japan 2Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan 3Australian Nuclear Science and Technology Organisation, Lucas Heights, NSW 2234, Australia 4School of Chemistry, The University of Sydney, Sydney 2006, Australia 5Research Institute for Interdisciplinary Science, Okayama University, Kita-ku, Okayama 700-8530, Japan