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Abstract
We have measured the muon-spin relaxation (μSR) in La 0.6Sr 0.4MnO 3 and in its layered sister system La 1.2Sr 1.8Mn 2O 7 to study the influence of dimensionality on their magnetic properties. Both compounds show ferromagnetic ordering with decreasing temperature. Above their Curie temperatures we followed the spin fluctuations. While the electron spin fluctuations in the three-dimensional La 0.6Sr 0.4MnO 3 slow down critically as the transition temperature is approached they remain finite in the layered material La 1.2Sr 1.8Mn 2O 7. We can fit them to 2D critical behaviour with a lower T C. In addition, we observe a spin precession signal in the ferromagnetically ordered state in La 1.2Sr 1.8Mn 2O 7; the temperature dependence of the muon precession frequency is in agreement with a three-dimensional character of the ordering.
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