Simulation of Shapiro Steps in Current-Voltage Characteristics of Intrinsic Josephson Junctions in High Temperature Superconductors

摘要

The phase dynamics of intrinsic Josephson junctions (IJJ) in high temperature superconductors is investigated. We calculate numeri cally the current-voltage characteristics (CVC) of IJJ in the framework of the capacitively coupled Josephson junctions model with diffusion cur rent. The effect of electromagnetic irradiation on the CVC of coupled Josephson junctions is demonstrated. Variation of the Shapiro steps and of the critical current with the radiation amplitude is systematically stud ied for a single junction. These results are generalized for a stack of cou pled Josephson junctions. The effects of coupling between junctions on the Shapiro steps in the CVC and on the electric charge oscillations in the superconducting layers at the parametric resonance are shown.