High-Critical-Current-Density SmBa₂Cu₃O_7-x Films Induced by Surface Nanoparticle

Abstract

In oxide-based superconducting thin films, conceivable factors that give rise to a pinning center include dislocations, precipitates, twin boundaries, and a -axis-oriented phases. In this study, crystalline defects were created perpendicular to a high- J c Sm 1+ x Ba 2- x Cu 3 O y film surface during a film deposition process. We obtained extremely high J c values, J c =0.37 MA/cm 2 (77 K, B ∥ c , B =5 T) and J c =0.1 MA/cm 2 (77 K, B ∥ c , B =8 T). These values are equal to or exceed that of the previously reported NbTi wire material measured in a high magnetic field at 4.2 K.