Abstract
The specific heat of a polycrystalline sample of MnO was measured from $T\ensuremath{\approx}1\mathrm{K}$ to $T\ensuremath{\approx}400\mathrm{K}$ using two different experimental apparatuses at zero applied pressure. Features revealed by the data include a hyperfine contribution due to the Mn nuclei, a ${T}^{2}$ temperature dependence at low temperatures due to the type-II antiferromagnetic magnon contribution, and a sharp but well defined antiferromagnetic transition ${(T}_{N}=117.7095\mathrm{K})$ that is clearly second order in nature. The critical exponent \ensuremath{\alpha} deduced from the transition is consistent with a two-dimensional Ising model. The specific heat of MnO is also compared with recent results on the type-A antiferromagnet ${\mathrm{LaMnO}}_{3}.$
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