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The critical specific heat of gadolinium

Abstract The problems encountered, when analysing specific heat data near the critical temperature, are tackled with particular reference to the critical specific heat of gadolinium. Experimental results are tested for consistency with theoretical models. We conclude that our data are not consistent with the parameter values predicted by theory for a simple (n = 3, d = 3) Heisenberg ferromagnet, although the general form of the model appears compatible. A model allowing the additional concept of a discontinuity at T c appears to produce a significant improvement in the resultant fit.