Heat capacity of EuS near the ferromagnetic transition

We report precision measurements of the heat capacity of EuS over the temperature range $1.5<~T<~33$K, with particular emphasis on the region near the Curie temperature $T_C=16.51\mathrm{}$ K. Our data yield $\alpha ={\alpha }^{\prime }=-0.13\mathrm{}\pm 0.02$ and $\frac{A}{A^{\prime }}=1.54\mathrm{}\pm 0.1$ for the exponents and the amplitude ratio of the specific heat. These results agree with those obtained previously for the isotropic antiferromagnet RbMn${\mathrm{F}}_3$, and with theoretical predictions. The previously reported anomalous behavior of EuO is discussed in terms of effects associated with crossover from isotropic shortrange force to dipolar behavior.