Abstract
Abstract : Superconducting weak links in various forms have the common feature that the supercurrent through the link is a periodic function of the gauge invariant quantum mechanical phase difference across the link (the Josephson Effect). A convenient form of the relation is (i sub s) = (i sub c) sin theta. The main qualitative features of devices derived from such weak links are derived according to analytically convenient relations. The total current through a weak link consists of three terms, the supercurrent (i sub s) = (i sub c) sin theta, a normal current i sub n = GV characterized by a conductance G and a displacement current (i sub D) - C(dV/dt) characterized by the shunt capacitance C of the weak link. The interaction of these three terms with each other and with any external circuit elements leads to a rich variety of experimentally observable and useful phenomena. Various forms of these effects are described and explained. This phenomenon provides the basis of a fundamental voltage standard, and heterodyne and video detectors of high frequency radiation. (Author)
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