Tunneling measurements on superconductor/insulator/superconductor junctions using single-crystal YBa2Cu3O7−x thin films
- 12 February 1990
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 56 (7) , 683-685
- https://doi.org/10.1063/1.103311
Abstract
We have, for the first time, made quasi‐particle tunneling measurements on a YBa2Cu3O7−x(001)/Y2O3 (001)/YBa2 Cu3 O7−x (001)junction, which was epitaxially grown on a MgO(100) substrate in an in‐situ process. Both layers of YBa2 Cu3 O7−x showed the same superconducting transition of Tc end =86 K with ΔT(R=10–90%)=1.5 K. Quasi‐particle tunneling in the direction perpendicular to the Cu‐O planes was measured. A gap parameter Δ(4.5 K) of 9.0±0.2 meV and a value of 2Δ/kTc of 3.5+0.4−0.6 were obtained.Keywords
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