Study on the thermal stability of the NdBCO film in inducing the growth of REBa2Cu3Ox/Ag superconductor bulks

The NdBCO-film is a prominent seed in melt-growth of REBa2Cu3Ox (REBCO, RE = rear earth element) cryomagnets because of its extremely high thermal stability (TS), which, however evidently degraded, when Ag was added into NdBCO for improving its brittle nature, leading to fabrication failure. Here we...
Ausführliche Beschreibung

The NdBCO-film is a prominent seed in melt-growth of REBa2Cu3Ox (REBCO, RE = rear earth element) cryomagnets because of its extremely high thermal stability (TS), which, however evidently degraded, when Ag was added into NdBCO for improving its brittle nature, leading to fabrication failure. Here we clarified that film TS is caused by high wettability of the Ag-added liquid, governed by precursor composition of REBCO/Ag. We developed a novel film-seed/buffer-pellet/main-pellet construction to effectively strengthen film TS via wetting modification by exploiting Ba-rich buffer-pellets, and succeeded in growing high superconductivity NdBCO/Ag bulks. This new conception is broadly applicable for producing all REBCO/Ag cryomagnets. Ausführliche Beschreibung