| The discovery and study of the Josephson effect not only made a good foundation for the development of superconducting electronics but also brought more chances and challenges to the whole superconductivity field. In the first part of this thesis, the history and development of the superconductor were introduced, Josephson effect was presented and the actuality of the superconducting electronics was reported. Research on Josephson junctions was reported in the last three chapters, which include the followings:(l)5X5[im common microbridges, 5 X 5(arn bicrystal microbridges and 10X10^m22X4 array microbridges were fabricated on YE^CusO?-x HTC thin film and GdBa2Cu3O7-x HTC thin film separately with standard photolithography method. By using SBR-1 oscilloscope, DC I-V curves of the three kinds of microbridges were observed at the temperature of liquid nitrogen. RSJ model and RCSJ model were used to analyze the results of our experiments.(2) Because the equation of the RCSJ model of superconducting Josephson junctions was a nonlinear second-order equation, it was difficult to give it analysis solutions, so the equation was solved by using Runge-Kutta method. The current-voltage characteristics of the Josephson junctions obtained from numerical calculation were in accord with the3results of our experiments, and McCumber parameter could be deduced from the comparison of the two results.(3) The I-V characteristics of the microbridges under the radiation of electromagnetic wave were studied, and the experimental results of microwave radiation and laser radiation were discussed qualitatively. |
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