Ying Chen, Zhanlong Wu, Xuejuan Gui, Guijing Duan, Shuo Li, Xiaoyu Xu, Kefan Du, Xinyu Shi, Rui Bian, Xiaohui Bo, G. Liu, Jun Luo, Jie Yang, Yi Cui, Rui Zhou, Jinchen Wang, RONG YU RONG YU, Weiqiang Yu
Abstract We perform 85 Rb nuclear magnetic resonance (NMR) measurements on the S = 1 bilayer triangular-lattice antiferromagnet Rb 2 Ni 2 (SeO 3 ) 3 in magnetic fields up to 26 T. In the field range from 3 to 26 T, the NMR spectral lines split, and their respective spectral weight ratios reveal the existence of the magnetic up-up-down (UUD) phase, although the 1/3-plateau phase is only attained in fields above 16 T. Two distinct gapless regimes are further identified: one at low fields and low temperatures, and the other at high fields and high temperatures, which are consistent with spin supersolid Y and V phases. Notably, the UUD-V phase boundary exhibits a negative slope in d T /d H , where the supersolid phase is located at temperatures above those of the solid phase because of strong low-energy spin fluctuations.