Electrical Properties of Langmuir-Blodgett Films Sandwiched between Pb–Bi Superconducting Electrodes

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Abstract
We have examined the electrical properties of insulating layers of both cadmium arachidate (C20) and polyamic acid long alkylamine salts (PAA), which are sandwiched between Pb–Bi superconducting electrodes, at a temperature below the critical temperature of a Pb–Bi alloy. Typical I-V characteristics of weak-coupled superconductors are shown in the absence of microwave powers, and normal step structures are shown in the I-V characteristics in the presence of microwave powers. We found that metallic pathways exist in the LB films. From the solution of Ginzburg-Landau equations, we obtained the result that the diameter of the metallic pathways is smaller than the London penetration depth of the Pb–Bi alloy. Finally, we concluded that although the bridging filaments exist in the LB layers, the efficiency of detecting microwaves is excellent in our SIS device.