Abstract
The magnetic equation of stateM(H, T) near the ferromagnetic transition point (T c =2.211 K) of GdCl3, a system in which the long-range dipole-dipole and the exchange interactions are of the same order of magnitude, is investigated. For a considerableM-H-T-region a scaling functionh(x) does exist. Qualitative analyses ofh(x) using series expansions and empirical forms show that the scaling function parameters of GdCl3 differ from those of systems with dominating short-range interactions. Quantitative comparison with the mean field theory (infinite range of interaction) and Stanley's high temperature series for nearest-neighbour Heisenberg interaction do not give satisfactory agreement.
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