Abstract
Superconducting systems separated by a very short weak link are treated using the one-dimensional Ginzburg—Landau theory. It is shown that in the limit of extremely narrow and/or dirty links I ∼ sin Δφ. In the dirty limit we obtain the well-known expression for the Josephson tunnel current. However, the normal tunnel resistance has been replaced by the resistance of the link in the normal state. The theoretical results are compared with our experimental investigations on thin-film microbridges of the Dayem type. Deviations from a sinusoidal current—phase relation are discussed in connection with microwave-induced subharmonic steps sometimes observed in the current—voltage characteristics.
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