Heating and Dynamic Enhancement in Metallic Weak Links
In this chapter we treat two contrasting examples of the longitudinal mode of quasiparticle disequilibrium. First, we treat the rather classical problem of heating effects in three-dimensional constriction weak links, which increase the Johnson noise, while reducing the critical current and energy gap. Second, we treat the more subtle nonequilibrium effects generated by a time-varying energy gap. These provide a kind of negative feedback effect which slows down the gap response time from τGL to τΔ, which may be orders of magnitude longer, and also provides a type of dynamic enhancement of superconductivity in current-driven metallic weak links.
KeywordsNoise Temperature Johnson Noise Nonequilibrium Effect Dynamic Enhancement Short Bridge
Unable to display preview. Download preview PDF.
- Aslamazov, L. G., and Larkin, A. I., 1976, Superconducting contacts with nonequilibrium electron distribution functions, Zh. Eksp. Teor. Fiz., 70: 1340;Google Scholar
- Golub, A. A., 1976, Dynamic porperties of short superconducting filaments, Zh. Eksp. Teor. Fiz., 71: 341;Google Scholar
- Holm, R., 1967, “Electric Contacts”, Springer-Verlag, Berlin.Google Scholar
- Likharev, K. K., and Yakobson, L. A., 1975, Steady-state properties of superconducting bridges, Zh. Tekh. Fiz., 45: 1503;Google Scholar
- Likharev, K. K., and Yakobson, L. A., 1975, Steady-state properties of superconducting bridges, Engl. transi. Sov. Phys. Tech. Phys., 20: 950.Google Scholar
- van Dover, R. B., de Lozanne, A., Howard, R. E., McLean, W. L., and Beasley, M. R., preprint, Refractory superconductor S-N-S microbridges.Google Scholar