Temperature and Magnetic Field Dependence of Critical Current Density of YBCO with Varying Flux Pinning Additions (POSTPRINT)

摘要

The critical current density (Jc) of YBa2Cu3O7-z films doped with varying flux pinning nanoparticle additions was systematically studied, for applied magnetic fields of H = 0 -9 T and operation temperatures T = 20 -77 K. Films were prepared with pulsed laser deposition by (M/YBCO)N multilayer or (YBCO)1-x Mx single-target methods, for different M phases including Y2O3, Y2BaCuO5 (Y211) green-phase, and BaZrO3. Very significant differences of Jc (H//c, 20 -77 K) were measured for optimized M phase additions, that are difficult to model or predict at present. Multilayer films with Y211 and Y2O3 nanoparticle additions had the highest Jc (20 -77 K) for H.