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Neutron scattering is used to investigate spin correlations in ultra puresingle crystals of the S=1 triangular lattice NiGa2S4. Despite a Curie-Weisstemperature of Theta_CW=-80(2) K, static (tau > 1 ns) short range (xi_ab=26(3)\AA) incommensurate order prevails for T>1.5 K. The incommensurate modulationQ_0=(0.155(3),0.155(3),0), Theta_CW, and the spin wave velocity (c=4400 m/s)can be accounted for by antiferromagnetic third-nearest neighbor interactionsJ_3=2.8(6) meV and ferromagnetic nearest neighbor coupling J_1=-0.35(9) J_3.Inter-plane correlations are limited to nearest neighbors and weakened by anin-plane field. These observations show that the short range ordered glassyphase that has been observed in a number of highly degenerate systems, canpersist near the clean limit.

Incommensurate short-range order in the S=1 triangular antiferromagnet NiGa2S4