Electron-tunneling studies of thin films of high-superconducting La-Sr-Cu-O
- 1 May 1987
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 35 (13), 7228-7231
- https://doi.org/10.1103/physrevb.35.7228
Abstract
We report results of the study of electron tunneling into thin films of the new high- superconductor La-Sr-Cu-O. Both sandwich-type tunneling with a Pb counterelectrode and point-contact tunneling have been successfully achieved. The results show exceptionally large energy gaps in these materials (roughly 20, 30, and possibly even 60 mV), larger than previously obtained on bulk sintered powders. We interpret these results as due to large anisotropy in this material or due to the presence of a a very high- layer near the surface of the films. The method of preparation of this new superconductor in thin film form is also discussed.
Keywords
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