SATURATED FLUX-PINNING IN THE YBA2CU3OY PRBA2CU3OY SUPERLATTICE/

The temperature dependent zero-field-cooled, field-cooled and remanent moment were measured at various applied magnetic field (from 10 Oe to 4000 Oe) for the YBa2Cu3Oy/PrBa2Cu3Oy (96 Angstrom/48 Angstrom superl attice to investigate the saturated flux pinning. The results showed t hat M(REM) = M(FC) - M(ZFC) as H less than or equal to 195 Oe while M( REM) > M(FC) - M(ZFC) as H > 203 Oe. This critical magnetic field (203 Oe in this report) is defined as H-s. H-s will be studied together wi th the penetration field H which is obtained from both the magnetic r elaxation for various applied magnetic field and the hysteresis curve. It is found that the H-s is closely related to H. The result are dis cussed by using the bean's critical state model.