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Impact of deoxygenation/reoxygenation processes on the superconducting properties of commercial coated conductors

Published inScientific reports, vol. 13, no. 1, 16917
Publication date2023-10-07
First online date2023-10-07
Abstract

We report the evolution of the superconducting properties of a commercial coated conductor during deoxygenation and reoxygenation processes. By analyzing the changes on the critical temperature, T c , and critical current density, J c , at 4 and 77 K, we have identified the conditions that cause a complete deoxygenation of the coated conductor and, also, the reoxygenation conditions that allow a recovery of the superconducting properties. A complete suppression of superconductivity happens at ~ 500–550 °C under a pure argon flow. After a complete deoxygenation, we observed that a reoxygenation process at ~ 400–450 °C in pure oxygen flow allows, not only a full recovery, but even an improvement in J c , both at 4 and 77 K. Such an increase of J c is kept or even enhanced, especially at 77 K, in the presence of magnetic fields up to ~ 6 T. A microstructural analysis by transmission electron microscopy did not give evidence of major differences in the densities of Y 2 O 3 nanoparticles and stacking faults between the pristine and reoxygenated samples, suggesting that these defects should not be the cause of the observed enhancement of J c . Therefore, the combined action of other types of defects, which could appear as a consequence of our reoxygenation process, and of a new level of oxygen doping should be responsible of the J c enhancement. The higher J c that can be achieved by using our simple reoxygenation process opens new parameter space for CCs optimization, which means choosing a proper p O 2 -temperature–time trajectory for optimizing J c .

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Citation (ISO format)
CAYADO LLOSA, Pablo et al. Impact of deoxygenation/reoxygenation processes on the superconducting properties of commercial coated conductors. In: Scientific reports, 2023, vol. 13, n° 1, p. 16917. doi: 10.1038/s41598-023-44086-7
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ISSN of the journal2045-2322
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Creation10/09/2023 7:27:20 AM
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