  We report a large persistent photoconductivity (PPC) in oxygen reduced PLD
grown YBa2Cu3O7-{\delta}/La2/3Ca1/3MnO3-y (YBCO/LCMO) superlattices scaling
with the oxygen deficiency and being similar to that observed in single layer
YBa2Cu3O7-{\delta} films. These results contradict previous observations where
in sputtered bilayer samples only a transient photoconductivity (TPC) was
found. We argue that the PPC effect in superlattices is caused by the PPC
effect due to the YBa2Cu3O7-x layers with limited charge transfer to
La2/3Ca1/3MnO3-y. The discrepancy arises from the different permeability of
charges across the interface and shed light on the sensitivity of oxide
interface properties on details of their preparation.
