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We report a method for the direct measurement of the current-phase i(θ) relations in superconducting weak links. We show that by proper choice of experimental parameters, an accurate measurement of i(θ) can be obtained in spite of obscuring effects of thermal fluctuations. This method has been used to obtain the current-phase relation of an oxidized niobium point contact and has shown that it conforms closely to the sinusoidal Josephson relation.
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Jackel et al. (1974) studied this question.
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