rf current dependence of the 8.9hyphen;GHz impedance of tantalum pointhyphen;contact Josephson junctions

摘要

The complex rf impedance of tantalum pointhyphen;contact Josephson junctions at 8.9 GHz has been measured as a function of the dc bias current for several values of rf current amplitude. The experimental results agree qualitatively with the predictions of the resistivelyhyphen;shuntedhyphen;junction model, but discrepancies between the experimental results and the theory suggest that this model does not adequately predict all of the impedance properties of these junctions.