Abstract
The temperature, microwave current, and dc magnetic field dependencies of the effective surface resistanceRs of YBa2Cu3O7−x grain boundary Josephson junctions have been investigated at 6 GHz. The junctions were prepared on stepped LaAlO3 substrates and incorporated into tapered linear half-wavelength microstrip resonators. The characteristic parameters of the heterogeneous resonator were analyzed theoretically considering the junction as a lumped element of complex impedance. The microwave properties of the junction could then be extracted and related to their characteristic dc transport properties. The critical currentIc of the junction was found to limit the linear power dissipation in the superconducting strip. At microwave currents aboveIc, highly nonlinear microwave losses occurred, which displayed a characteristic magnetic field modulation. At even higher currents,Rs saturated at a level corresponding to the normal resistanceRn of the junction.
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