Abstract
Heat capacities of ferroelectromagnetic crystals YMnO3, ErMnO3, and LuMnO3 were measured in a temperature range of 2–300 K and in some magnetic fields between 0 and 9 T. Heat capacity anomalies were observed at around 71, 79, and 84 K in YMnO3, ErMnO3, and LuMnO3 crystals, respectively, due to an antiferromagnetic phase transition. Schottky anomalies were observed in ErMnO3 crystal due to population changes among the energy levels of erbium ions. In the low temperature region and in zero magnetic field, a heat capacity term proportional to temperature was observed in YMnO3 and LuMnO3 crystals possibly due to an unusual magnetic excitation.
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