Abstract
The critical exponents β, γ, δ and the scaling function of ferromagnetic Cu(NH 4) 2Br 4, 2H 2O and CuRb 2Br 4, 2H 2O have been determined. The experimental scaling function is close to the theoretical one of three-dimensional Heisenberg model and the scaling laws are approximately fullfilled. The measured susceptibilities agree well with theoretical results for slightly anisotropic Heisenberg ferromagnet. The predicted cross-over effect, well observed on the perpendicular susceptibility, allows to explain the low experimental value of γ.
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