Fig. 2
From: Collective magnetism in an artificial 2D XY spin system
Temperature-dependent zero-field μSR depolarisation spectra for Sample Set 2. a Time-dependent muon-spin depolarisation function P(t) (symbols) for the non-interacting sample (a = 140 nm), with fits according to the Eq. (2) (lines). The muon polarisation gradually decreases at lower temperatures due to the slowing down of the single-particle magnetic fluctuations. b P(t) for the strongly interacting sample (a = 70 nm). In comparison to the non-interacting sample, the curves show already significant damping at higher temperatures. In addition, at TC ≈ 100 K a fast relaxation contribution is observed at early times (thick red curve). The error bars indicate the standard deviation, with a total number of events per spectrum of 5 × 106 (a) and 107 (b)
