Abstract
Specific heat anomalies in YBa 2 Cu 3 O 7−δ (YBCO) and CuO were investigated in the temperature range 200 K to 240 K. It was found that small amounts of CuO contained as a separate phase in YBCO produce easily observable anomalies caused by two consecutive antiferromagnetic (AF) transitions at 211.6 K and 228.3 K in CuO. The anomalies hence were observed in both pure CuO and YBCO samples containing some free CuO. The anomalies found here are of a different character than the broad peak we observed earlier around 220 K in pure ceramic YBCO. This lends support to the earlier interpretation of the 220 K anomaly as a structurally related one.
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