Germanium-overcoated niobium Dayem bridges
- 15 May 1976
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 28 (10) , 632-634
- https://doi.org/10.1063/1.88603
Abstract
Overcoating constriction microbridges with semiconducting germanium provides additional thermal conductivity at liquid‐helium temperatures to reduce the effects of self‐heating in these Josephson junctions. Microwave‐induced steps were observed in the I‐V characteristics of an overcoated Dayem bridge fabricated in a 15‐nm‐thick niobium film; at 4.2 K (Tc−T=2.6 K), at least 20 steps could be counted. No steps were observed in the I‐V characteristics of the bridge prior to overcoating. In addition, the germanium overcoat can protect against electrical disturbances at room temperature.Keywords
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