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Anomalies in the heat capacity due to spin reorientation transitions have been successfully detected for two orthoferrites by chopped-light ac calorimetry on single-crystals. Onset and completion of the spin reorientation were clearly detected as jumps in heat capacity at 82 and 89K for TmFeO 3 and at 53 and 59K for HoFeO 3 . The magnitude of the anomalies is less than 1% with respect...
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