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To examine the thermodynamic properties ofPr$_{2}$Ba$_{4}$Cu$_{7}$O$_{15-\delta }$ compounds with metallic CuO doublechains, we measured the specific heats of superconducting andnon-superconducting polycrystalline samples at low temperatures (1.8-40 K)under various magnetic fields (up to 9 T). In the as-sinterednon-superconducting sample, a $\lambda-$like enhancement in the specific heatmeasurement appeared near the antiferromagnetic transition temperature$T_{N}=17$ K. In contrast, the reduced superconducting sample with$T_{c,on}=26.5$ K exhibited no obvious superconducting anomaly in its specificdata, but a Schottky-like broad maximum appeared at low temperatures. TheSchottky-like anomaly was attributed to low-lying quasi-triplet splitting ofPr$^{3+}$ ions under the crystal field effect.

Thermodynamic Properties of Superconducting and Non-Superconducting Pr$_{2}$Ba$_{4}$Cu$_{7}$O$_{15-\delta }$ Compounds with Metallic Double Chains