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Using Takanaka's theory of the zero-field dc-current steps of a Josephson tunnel junction, we have studied the effect of the junction Q factor on the shape of the current step near the first even-order resonant voltage V=h{₂}e, where ₂ is the frequency of the fundamental cavity mode. In addition, we have found that the effect of a magnetic field on the step height can be qualitatively explained by modifying Takanaka's theory to include a magnetic-field-dependent term.
Chang et al. (Mon,) studied this question.
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