Influence of spin fluctuations on the specific heat and entropy of weakly itinerant ferromagnets

From a theory including the effects of spin fluctuations via renormalization of the Landau coefficients, the magnetic contributions to the specific heat $c_m$ and entropy $S_m$ are calculated. In a generalization $c_m$ and $S_m$ are given for cases when the spin-fluctuation amplitude saturates for temperatures lower than or comparable with the Curie temperature. For the unsaturated case a model for the discontinuity of the specific heat at the Curie temperature is derived. A discussion of the predictions with respect to experimental results is given.