Coherent Behavior and Nonmagnetic Impurity Effects of the Spin Disordered State in NiGa${}_2$S${}_4$

Abstract

Nonmagnetic impurity effects of the spin disordered state in the triangular antiferromagnet NiGa${}_2$S${}_4$ was studied through magnetic and thermal measurements 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 spin disordered state. However, the suppression is not complete and the robust feature of the T^2 dependent specific heat and its scaling behavior with the Weiss temperature indicate the existence of a coherent Nambu-Goldstone mode. Absence of either conventional magnetic order or bulk spin freezing suggests a novel symmetry breaking of the ground state.

4 pages, 4 figures

References in corpus (4)

• Spin Liquid State in an Organic Mott Insulator with Triangular Lattice
• Long range Neel order in the triangular Heisenberg model
• Nonmagnetic Insulating States near the Mott Transitions on Lattices with Geometrical Frustration and Implications for $\kappa$-(ET)${}_2$Cu${}_2(CN{)}_3$
• Spin Liquid in the Multiple-Spin Exchange model on the Triangular lattice: 3He on graphite

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