In-Situ Approach to Introduce Flux Pinning in YBCO (Postprint).

摘要

Several in-situ methods to introduce ultra-high densities of defects into YBCO to enhance flux pinning are reviewed, including rare-earth or chemical substitution or additions, and nanoparticle additions by various processing methods. The results were compiled using studies published recently or that are publicly available. Superconducting and microstructural properties are compared for different nanoparticle additions including Y211, Y2O3, CeO2, Sm123, MgO, La211, IrZO3, BaZrO3, and mixed (Y,RE)123 compositions. Results are included for thin films deposited on single crystals and metallic substrates, and for bulk powders. Of the methods reviewed, only processing conditions that produced nanoparticle additions have demonstrated significant Jc(H) enhancements for high fields Happl>0.3T, whereas rare-earth-only substitutions have increased Jc(H) at low-fields.