Journal ArticleQuantum spin state transitions in the spin-1 equilateral triangular lattice antiferromagnet <math><mrow><msub><mi>Na</mi><mn>2</mn></msub><mi>BaNi</mi><msub><mrow><mo>(</mo><msub><mi>PO</mi><mn>4</mn></msub><mo>)</mo></mrow><mn>2</mn></msub></mrow></math>Li, N.; Huang, Q.; Brassington, A.; Yue, X. Y.; Chu, W. J.; Guang, S. K.; Zhou, X. H.; Gao, P.; Feng, E. X.; Cao, H. B.; Choi, E. S.; Sun, Y.; Li, Q. J.; Zhao, X.; Zhou, H. D.; Sun, X. F.2021-09-0110322742Physical Review B104102469-9950https://doi.org/10.1103/PhysRevB.104.1044032003117National Science Foundation