Phenomenology and corrections to scaling in Heisenberg ferromagnets

We have compared experimental data near criticality for the spontaneous magnetization of europium sulfide and for the spontaneous magnetization and the zero-field susceptibility of europium oxide with two theoretical formulas. One of these appends to the asymptotic scaling formula the nonanalytic correction to scaling given by the leading irrelevant variable; the second appends only the corrections to scaling that result if all irrelevant variables are neglected. It is found that, within the limits of experimental error, both formulas are consistent with the data for both the theoretical and experimental values of the susceptibility exponent {γ}. Some earlier work on nickel, which is in the same universality class as the two above europium compounds, is reexamined in the light of these results.