A considerably large transport critical current density Jc (1.2ȕ105 A/cm2 at 4.2 K and 15 T) was observed for the superconducting Ba-Y-Cu-O thin films prepared by an rf sputtering method. In association with such a large Jc, the hysteresisof Jc against the applied magnetic field was smaller compared to that in bulk samples prepared by a solid phase reaction method. It was considered that a fairly smooth morphology of grainboundaries in the thin films improved superconducting properties. The hysteresis of Jcwas discussed on the basis of the weak link model.
- Ba-Y-Cu-O, transport critical current density
- Oxide superconductor
- Rf sputtering
ASJC Scopus subject areas
- Physics and Astronomy(all)