Modified anisotropy and distinct phase diagrams in the nearly isotropic S=1 triangular-lattice antiferromagnet Rb 2Ni(SeO 3) 2
The study compared Rb2Ni(SeO3)2 with K2Ni(SeO3)2 to show how magnetic anisotropy changes phase behavior in nearly isotropic triangular-lattice antiferromagnets. Rb2Ni(SeO3)2 exhibits easy-axis anisotropy, leading to a split Néel transition and magnetization plateaus under magnetic fields, highlighting the crucial role of competing single-ion and exchange anisotropies in generating novel quantum phases.