Abstract
We report results of a study of electron tunneling into bulk samples of the new high- superconductor Y-Ba-Cu-O using point-contact tunneling. Based on a superconductive tunneling interpretation, the results show exceptionally large energy gaps in these materials (roughly 2Δ=100 meV), implying 2Δ/∼13. Similar values were found previously by us for La-Sr-Cu-O. We also see Structure in the I-V curves similar to that seen in La-Sr-Cu-O. On the basis of the asymmetries observed in the I-V characteristics, we believe that the natural tunneling barrier on this material is of the Schottky type.
- Received 18 March 1987
DOI:https://doi.org/10.1103/PhysRevB.35.8850
©1987 American Physical Society