Because the Josephson pair current in a weak‐link superconductor junction is a nonlinear parametric function of junction voltage, the ac impedance seen by the junction influences both the response time to changes in bias and the dc voltage‐current characteristics. The first effect is obvious; the second, considered here, has not been generally recognized. Both are relevant to device design. Two special cases which illustrate the basic principles involved are worked out in detail; they correspond, respectively, to ac capacitive and inductive loading. The results partly explain differences in the dc voltage‐current characteristics of plane‐parallel and point‐contact junctions.
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© 1968 The American Institute of Physics.
1968
The American Institute of Physics
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