Superconductivity in Pr2Ba4Cu7O15-delta with metallic double chains

TL;DR

This paper reports the discovery of superconductivity around 10K in Pr2Ba4Cu7O15-delta, linked to metallic double chains and oxygen deficiency, highlighting the role of structural changes in inducing superconductivity.

Contribution

It demonstrates that oxygen deficiency and structural modifications in Pr2Ba4Cu7O15-delta induce superconductivity in metallic double chains, a novel finding in this compound.

Findings

Superconductivity observed at ~10K in Pr2Ba4Cu7O15-delta.

Reduction treatment enhances metallic conduction and induces superconductivity.

Oxygen deficiency causes c-axis elongation associated with superconductivity.

Abstract

We report superconductivity with $T_{c,onset}$=$\sim$10K in Pr$_{2}$Ba$_{4}$Cu$_{7}$O$_{15-\delta}$ compound possessing metallic double chains. A reduction treatment on as-sintered samples causes not only the enhanced metallic conduction but also the appearance of superconductivity accompanied by the c-axis elongation due to oxygen deficiency.