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Germanium-overcoated niobium Dayem bridges (1976)

Holdeman, L. B. ; Peters, P. N.

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Publication Date: 2011-08-17

Description: 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 least 20 steps could be counted at 4.2 K. 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: ELECTRONICS AND ELECTRICAL ENGINEERING

Type: Applied Physics Letters; 28; May 15

Format: text

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