Low-leakage thin-film superconductor-insulator-normal metal tunnel junctions on co-evaporated Ba1−xRbxBiO3 and rf-sputtered Ba1−xKxBiO3
- 9 March 1992
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 60 (10) , 1262-1264
- https://doi.org/10.1063/1.107340
Abstract
The oxide superconductors Ba1−xKxBiO3 and Ba1−xRbxBiO3 exhibit ideal BCS‐like characteristics with Tc∼30 K. We report the deposition of thin films with zero‐resistance temperatures up to 25 K and transition widths less than 1 K by thermal co‐evaporation and rf sputtering. Thin‐film S‐I‐N tunnel junctions fabricated by evaporating Ag or Au onto a native barrier exhibit low leakage over 1 mm2 junctions and near‐ideal BCS‐like behavior with a value of 2Δ(0)/kBTco=3.5±0.2.Keywords
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