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Direct measurements have been made of the current-phase relation (CPR) of photolithographic tin microbridges, scribed indium microbridges, proximity bridges, and point contacts. Hysteretic current-phase relations have been observed in uniform-thickness tin microbridges, while proximity bridges have sinusoidal or nearly sinusoidal current-phase relations.
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Jackel et al. (1976) studied this question.
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