Abstract
The temperature, microwave current, and dc magnetic field dependencies of the effective surface resistanceR s 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 currentI c of the junction was found to limit the linear power dissipation in the superconducting strip. At microwave currents aboveI c , highly nonlinear microwave losses occurred, which displayed a characteristic magnetic field modulation. At even higher currents,R s saturated at a level corresponding to the normal resistanceR n of the junction.
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Hein, M.A., Beuven, S., Gottschlich, M. et al. Experimental evaluation of the nonlinear surface resistance of YBa2Cu3O7−x step-edge grain boundary Josephson junctions. J Supercond 9, 233–236 (1996). https://doi.org/10.1007/BF00728308
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DOI: https://doi.org/10.1007/BF00728308