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Nonmagnetic impurity effects of the spin disordered state in the triangularantiferromagnet NiGa$_2$S$_4$ was studied through magnetic and thermalmeasurements for Ni$_{1-x}$Zn$_x$Ga$_2$S$_4$ (0.0\le x\le 0.3). Only 1 %substitution is enough to strongly suppress the coherence observed in the spindisordered state. However, the suppression is not complete and the robustfeature of the T^2 dependent specific heat and its scaling behavior with theWeiss temperature indicate the existence of a coherent Nambu-Goldstone mode.Absence of either conventional magnetic order or bulk spin freezing suggests anovel symmetry breaking of the ground state.Comment: 4 pages, 4 figure

Coherent Behavior and Nonmagnetic Impurity Effects of Spin Disordered State in NiGa2S4

Coherent Behavior and Nonmagnetic Impurity Effects of Spin Disordered State in NiGa₂S₄