Nonlinear electrodynamics of narrow superconducting films
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Narrow strips of superconducting thin films can serve as effective reactive nonlinear elements when they are sufficiently uniform (constant cross section along their length). The Q-factors of such elements can be made fairly high for frequencies right up to the beginning of the submillimeter range when they are cooled to temperatures amounting to 0.2 to 0.3 of the critical temperature.
The level of the reactive nonlinearity of the films changes. This conclusion is in agreement with the experimental results .
The noticeable portion of the resistive losses in films at high currents is associated with processes of relaxation of the order parameter.
Of the possible microwave systems using the film strips studied here, the most promising are parametric amplifiers and travelling-wave converters. This is related both to the possibility of realizing fairly long uniform film strips and to the increase in the propagation constant (proportional to (1+l l /lg)) when the running kinetic inductancel l increases.
KeywordsThin Film Microwave Critical Temperature High Current Narrow Strip
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