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

Article Article scientifique Article Impact of deoxygenation/reoxygenation processes on the superconducting properties of commercial coated conductors eng 2023-10-07 2023-10-07 author Cayado Llosa Pablo 0000-0003-3703-6122 945910 Département de physique de la matière quantique (FIMAC) author Bonura Marco 0000-0002-8512-0989 733611 Département de physique de la matière quantique (FIMAC) author Lucas Esparseil Celia 983877 Département de physique de la matière quantique (FIMAC) author Saule Enora 971891 author Rijckaert Hannes author Bagni Tommaso 929717 author Konstantopoulou Konstantina author Alessandrini Matteo author Senatore Carmine 0000-0002-9191-5016 561307 Département de physique de la matière quantique (FIMAC) 16917 10.1038/s41598-023-44086-7 37805658 2045-2322 https://www.nature.com/articles/s41598-023-44086-7 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 . Dewey 500.2 34 Département de physique nucléaire et corpusculaire 132 33 Département de physique de la matière quantique 131 false 679 Groupe Senatore Scientific reports 13 1 02e97db7-7695-4978-8b3b-a193a9a4f871 Article (Published version) Public Article-scientifique-from-unpaywall.pdf 2364376 application/pdf CC BY 504eeda235b58a2f2b30e9e589e13719e6478e75e88e9f6149a1a7b771dca7bc openAccess Faculté des sciences / Section de physique / Département de physique nucléaire et corpusculaire Faculté des sciences / Section de physique / Département de physique de la matière quantique

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Impact of deoxygenation/reoxygenation processes on the superconducting properties of commercial coated conductors	Scientific reports			2023	81	21

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Lucas Esparseil, Celia