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We report a study of the triangular lattice Heisenberg magnet NiGa2S4 by thepositive muon spin rotation and relaxation technique. We unravel threetemperature regimes: (i) below T_c = 9.2(2) K a spontaneous static magneticfield at the muon site is observed and the spin dynamics is appreciable: thetime scale of the modes we probe is ~ 7 ns; (ii) an unconventional stretchedexponential relaxation function is found for T_c < T < T_{cross} whereT_{cross} = 12.6 K, which is a signature of a multichannel relaxation for thistemperature range; (iii) above T_{cross}, the relaxation is exponential asexpected for a conventional compound. The transition at T_c is of thecontinuous type. It occurs at a temperature slightly smaller than thetemperature at which the specific heat displays a maximum at low temperature.This is reminiscent of the behavior expected for theBerezinskii-Kosterlitz-Thouless transition. We argue that these results reflectthe presence of topological defects above T_c.

Short-range magnetic ordering process for the triangular lattice compound NiGa2S4: a positive muon spin rotation and relaxation study