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We prepared the YBa2Cu3Oy films and YBa2Cu3Oy/PrBa2Cu3Oy (YBCO/
PB CO) superlattices onto the SrTiO3(001) substrates in an off-
axis RF magnetron sputtering system. The powder X-ray
diffraction showed that the films were c-axis epitaxially
oriented. Measurements of both the longitudinal resistivities
and the Hall resistivities for a YBa2Cu3Oy films as a function
of temperature for different J and B are shown. We found that,
for the same Lorentz force J×B with different J and B, neither
ρxx-T norρxy-T curves would follow the same trace in the
mixed state. The data suggested that both J and B affects the
transport behaviors of YBCO films in the mixed state. How the
transport current density affects the behavior was investigated
in this work. In addition, we investigated the angular
dependence of critical current of a YBCO/PBCO superlattice and
the results are discussed with the 2D Kes and 3D Tachiki models.
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