Point-contact electron tunneling into the high-Tc superconductor Y-Ba-Cu-O
Abstract
We report results of a study of electron tunneling into bulk samples of the new high-Tc 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/kCTc~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.
- Publication:
-
Physical Review B
- Pub Date:
- June 1987
- DOI:
- 10.1103/PhysRevB.35.8850
- Bibcode:
- 1987PhRvB..35.8850K
- Keywords:
-
- Electron Tunneling;
- High Temperature Superconductors;
- Mixed Oxides;
- Volt-Ampere Characteristics;
- Yttrium Oxides;
- Barium Oxides;
- Copper Oxides;
- Schottky Diodes;
- X Ray Diffraction;
- Solid-State Physics;
- 74.50.+r;
- 74.70.Ya;
- Tunneling phenomena;
- point contacts weak links Josephson effects