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• W4387426390 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, Tc, and critical current density, Jc, 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 Jc, both at 4 and 77 K. Such an increase of Jc 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 Y2O3 nanoparticles and stacking faults between the pristine and reoxygenated samples, suggesting that these defects should not be the cause of the observed enhancement of Jc. 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 Jc enhancement. The higher Jc that can be achieved by using our simple reoxygenation process opens new parameter space for CCs optimization, which means choosing a proper pO2-temperature-time trajectory for optimizing Jc." @default.
• W4387426390 created "2023-10-08" @default.
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• W4387426390 date "2023-10-07" @default.
• W4387426390 modified "2023-10-11" @default.
• W4387426390 title "Impact of deoxygenation/reoxygenation processes on the superconducting properties of commercial coated conductors" @default.
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• W4387426390 doi "https://doi.org/10.1038/s41598-023-44086-7" @default.
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• W4387426390 hasPublicationYear "2023" @default.
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