Nonequilibrium properties of variable-thickness superconducting micro-bridges. Interim report
The experimental properties of tin and lead variable-thickness micro-bridges were investigated. The dc I-V characteristics and the high frequency response of these Josephson devices were determined or modified by nonequilibrium effects. The gap and the subharmonic gap structure observed in the dc I-V characteristics of the microbridges was used as a local thermometer in order to demonstrate the correlation between low dissipation, reduced hysteresis, and the good high frequency performance of the variable-thickness microbridges. Measurement of low voltage foot-like features of the I-V characteristics were found to be consistent with a voltage-dependent enhancement of the supercurrent induced by the disequilibrium of the quasi-particles during the Josephson cycle. Comparison of the experimental data with the predictions of the models of Golub and of Aslamazov and Larkin showed many points of agreement in the regimes where these theories are applicable.
- Research Organization:
- Harvard Univ., Cambridge, MA (USA). Gordon McKay Lab. of Applied Science
- DOE Contract Number:
- N00014-77-C-0085; N00014-75-C-0648
- OSTI ID:
- 6596195
- Report Number(s):
- AD-A-049779; TR-13
- Country of Publication:
- United States
- Language:
- English
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