Resonant tunneling transport across YBa2Cu3O7–SrRuO3 interfaces

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Abstract
We have investigated superconductor–normal metal–superconductor junctions with metallic perovskite SrRuO3 barriers. Ramp‐type junctions with ion‐beam‐etched and wet‐chemical‐etched YBa2Cu3O7 (YBCO) ramps have been compared with planar junctions where the interfaces were fabricated completely in situ. Regardless of the fabrication method, the junction properties were determined not by the metallic SrRuO3 barrier, but by an insulating layer at the interface. The shape of the I–V curves, and the temperature dependence of the normal resistance of junctions, could be well explained by quasiparticle resonant tunneling via two localized states in the interface layer. Furthermore, a model for the Cooper pair transport will be discussed that assumes resonant tunneling via one localized state as transport mechanism.

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