Specific heat ofCr2O3near the Néel temperature

Precise measurements of the specific heat of the uniaxial antiferromagnet ${\mathrm{Cr}}_2$ ${\mathrm{O}}_3$ near the antiferromagnetic transition temperature are reported. Least-mean-squares analysis of the data yields Heisenberg-like exponents, $\frac{A}{A^{\prime }}=0.56\mathrm{}$, but the amplitude ratio $\alpha ={\alpha }^{\prime }-0.12\mathrm{}$ is not in agreement with experimental results for Heisenberg systems. No indication of crossover to Ising-like behavior near the transition is observed. A critical discussion of the possible effects of systematic error in comparing theoretical and experimental results for the specific heats of magnetic systems is provided.