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sandwiched between two superconducting electrodes, where the barrier acts as a weak link between the superconductors. Depending on its nature, this weak link can be an insulating layer, a normal metal, or a narrow constriction, giving rise to different classes of Josephson junctions (SIS, SNS, or constriction junctions). Over the years, a wide variety of materials have been explored for both the electrodes and the barrier in order to optimize junction performance for specific applications.Material selection

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