Nonequilibrium Properties of Variable-Thickness Superconducting Micro-bridges.
Abstract
The experimental properties of tin and lead variable-thickness micro-bridges have been investigated. The dc I-V characteristics and the high frequency response of these Josephson devices are determined or modified by nonequilibrium effects. The gap and the subharmonic gap structure observed in the dc I-V characteristics of our microbridges is used as a local thermometer in order to demonstrate the correlation between low dissipation, reduced hysteresis, and the good high frequency performance of our variable-thickness microbridges. Measurement of low voltage foot-like features of the I-V characteristics are 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 show many points of agreement in the regimes where these theories are applicable.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1978
- Accession Number
- ADA049779
Entities
People
- Miguel Octavio
Organizations
- Harvard University