Size order and interface effects on PrBa₂Cu₃Ov barriers

The artificially varied structural quality of interfaces significantly affects the transport properties of YB₂₇-PrBa₂Cu₃O₇-YBa ₂Cu₃O₇ junctions. The mechanism of conductivity changes from a semiconducting-like to a metal-like one with an improvement of the interface quality the microstructure of the materials and the reduction of the barrier thickness. The proposed model including a carrier induced superconductivity and a bending of the electronic bands at the interfaces gives a satisfactory explanation of the experimental results.