Abstract
High quality superconductor-barrier interfaces are critical for Josephson tunnel junctions. The authors show that such interfaces can be achieved in MgB2/insulator/Pb trilayer junctions using MgB2 films grown by hybrid physical-chemical vapor deposition and with barriers formed at elevated temperatures. The junctions show clear Josephson tunneling characteristics with high Jc (∼3kA∕cm2), high IcRN products (∼1.9meV), and the expected Ic(B) pattern. The observed π gap is small (2.0meV) and the σ gap is large (7.4meV), in agreement with theoretical predictions and indicating that the superconducting property of MgB2 is not degraded at the MgB2-insulator interface.
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