Superconductivity in small metal bridges
Abstract
Josephson effects in weaklinks are discussed for low and high frequency regimes using simple perturbation techniques. It is proven that no measurement of the supercurrent dependence upon frequency above the Riedel peak frequency can be made using RF sources whose frequencies are below the Riedel peak. The bulk of work done in the field on the high frequency structure of the Josephson current is shown to be invalid. Metal bridges shorter than a newly defined temperature independent length for superconductors are proven to be identical in their Josephson current behavior to tunneling junctions. The BCS gap equation is generalized to include voltage gradient effects on pairs within the bridge. The oscillation frequency for long bridges is shown to be limited to less than 10 Hz. An experimental test of the voltage dependent gap is made as well as tests of the pair reforming time of bridges.
- Publication:
-
Ph.D. Thesis
- Pub Date:
- December 1975
- Bibcode:
- 1975PhDT........27H
- Keywords:
-
- Electric Bridges;
- Josephson Junctions;
- Superconductivity;
- Electric Potential;
- Electron Tunneling;
- Performance Tests;
- Solid-State Physics