Thermodynamic Properties of Superconducting and Non-Superconducting Pr${}_2$Ba${}_4$Cu${}_7$O${}_{15-\delta }$ Compounds with Metallic Double Chains

Abstract

To examine the thermodynamic properties of Pr${}_2$Ba${}_4$Cu${}_7$O${}_{15-\delta }$ 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 $\lambda -$like enhancement in the specific heat measurement 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 specific data, but a Schottky-like broad maximum appeared at low temperatures. The Schottky-like anomaly was attributed to low-lying quasi-triplet splitting of Pr${}^{3+}$ ions under the crystal field effect.

arXiv comment6 pages, 5 figures

References in corpus (5)

• Superconductivity in Pr2Ba4Cu7O15-delta with metallic double chains
• Angle-resolved photoemission study of insulating and metallic Cu-O chains in PrBa${}_2$Cu${}_3$O${}_7$ and PrBa${}_2$Cu${}_4$O${}_8$
• Superconductivity in the CuO double chain of Pr_2Ba_4Cu_7O_15-delta on the basis of Tomonaga-Luttinger liquid theory
• Dimensionality-driven spin-flop transition in quasi-one-dimensional PrBa2Cu4O8
• Physical properties of a new cuprate superconductor Pr_2Ba_4Cu_7O_{15-δ}

Cited by in corpus (1)

• Effect of pressure on magneto-transport properties in the superconducting and normal phases of the metallic double chain compound Pr${}_2$Ba${}_4$Cu${}_7$O${}_{15-\delta }$