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The temperature dependence of the initial susceptibility ₀ of nickel above the Curie point T₂ and the field dependence of its magnetization at T₂ are deduced from the data of Weiss and Forrer and found to be at variance with the simple molecular-field model. Instead, the experimental {₀}^-1-versus-T curve just above T₂ is shown to follow the simple relation {₀}^-1=A (T-{T₂]}^, with =1. 350. 02, in excellent agreement with the 43-power relation recently predicted from the exact series for the Heisenberg model. From the coefficient A, it is deduced that ₀, the average atomic moment, is 0. 642 ₁ and that the individual electron moments are in a state corresponding to S=12. At higher temperatures, the {₀}^-1-versus-T curve deviates from the Heisenberg-model predictions, possibly because of a gradual rise in ₀ with increasing temperature. Up to the highest field H of measurement, the magnetization at T₂ is shown to vary as H^ with =0. 237, which is consistent with the exponent values for an analogous empirical relationship between the density and pressure of several different gases at their critical points.
Kouvel et al. (Mon,) studied this question.