Abstract
To examine the thermodynamic properties of Pr2Ba4Cu7O15-δ compounds with metallic CuO double chains, we measured the specific heats of superconducting and non-superconducting polycrystalline samples at low temperatures (1.8–40 K) under various magnetic fields (up to 9 T). In the as-sintered non-superconducting sample, a λ-like enhancement in the specific heat measurement appeared near the antiferromagnetic transition temperature TN=17 K. In contrast, the reduced superconducting sample with Tcon=26.5 K exhibited no obvious superconducting anomaly in its specific heat data, but a Schottky-like broad maximum appeared at low temperatures. The Schottky-like anomaly was attributed to low-lying quasi-triplet splitting of Pr3+ ions under the crystal field effect.
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