Incommensurate short-range order in the S=1 triangular antiferromagnet NiGa2S4
Abstract
Neutron scattering is used to investigate spin correlations in ultra pure single crystals of the S=1 triangular lattice NiGa2S4. Despite a Curie-Weiss temperature of ThetaCW=-80(2) K, static (tau > 1 ns) short range (xiab=26(3) ) incommensurate order prevails for T>1.5 K. The incommensurate modulation Q0=(0.155(3),0.155(3),0), ThetaCW, and the spin wave velocity (c=4400 m/s) can be accounted for by antiferromagnetic third-nearest neighbor interactions J3=2.8(6) meV and ferromagnetic nearest neighbor coupling J1=-0.35(9) J3. Inter-plane correlations are limited to nearest neighbors and weakened by an in-plane field. These observations show that the short range ordered glassy phase that has been observed in a number of highly degenerate systems, can persist near the clean limit.
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