Abstract
Two superconducting systems joined by a weak link present a great variety of phenomena which are not totally explained by the Josephson formulation. In this paper we give a general theory of the phenomena observed in these systems when time-dependent effects are taken into account. The formulation, presented as an application of the boson method in superconductivity, is derived from first principles in the framework of a microscopic theory. Our results show the appearance of harmonic and subharmonic steps in theI-V characteristic of the system; the presence or not of subharmonic steps is essentially determined by the geometry of the system. The existence of subharmonic terms in a.c. effects is shown to be strongly related to the diffraction pattern presented by theI c -H curves in d.c. experiments performed on the same sample. A comparison of the usual theory and the present formulation is discussed.
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