Abstract
An overview is given on muon spin relaxation (μSR) measurements in frustrated and/or low dimensional spin systems. In the frustrated Kagomé lattice system SrCr8Ga4O19, we observed dynamic spin fluctuations of ∼ 30 GHz, without any static frozen component even atT=0.1 K, much below the susceptibility-cusp temperatureT g=3.5 K. This is in clear contrast with the case in dilute-alloy spin glassesCuMn andAuFe, where static order develops belowT g. We also present the dimensionality dependence of the sub-lattice magnetization curves in 2-d Heisenberg systems, the remarkable suppression of the ordering temperature in a 1-d system Sr2CuO3, the observation of activation type spin dynamics in a 1-d Ising ferromagnet (DMeFc)(TCNE) aboveT c, slow spin fluctuations (∼ 60 MHz) in Haldane-gap systems at low temperatures, and some results from organic 1-d and 2-d magnetic systems.
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Uemura, Y.J., Keren, A., Le, L.P. et al. Muon spin relaxation studies in frustrated and/or low-dimensional spin systems. Hyperfine Interact 85, 133–144 (1994). https://doi.org/10.1007/BF02069413
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DOI: https://doi.org/10.1007/BF02069413