Spin-supersolidity induced quantum criticality and magnetocaloric effect in the triangular-lattice antiferromagnet Rb 2 Co(SeO 3 ) 2 (opens in new tab)

We performed high-field magnetization, magnetocaloric effect (MCE), and NMR measurements on the Ising triangular-lattice antiferromagnet Rb2Co(SeO3)2. The observations of the 1/3-magnetization plateau, the NMR line splits, and the thermal activation behaviors of the spin-lattice relaxation rate 1/T1 between 2 and 15.8 T provide unambiguous evidence of a gapped up–up–down (UUD) magnetic ordered phase. For fields between 15.8 and 18.5 T, the anomaly in the magnetic susceptibility, the slow satu...