Direct measurement of the Josephson supercurrent in an ultrasmall Josephson junction |
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Authors: | Steinbach A Joyez P Cottet A Esteve D Devoret M H Huber M E Martinis J M |
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Institution: | Service de Physique de l'Etat Condensé, CEA-Saclay, F-91191 Gif-sur-Yvette, France. |
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Abstract: | We have measured the supercurrent flowing through a nonhysteretic, ultrasmall, voltage-biased Josephson junction. In contrast with experiments performed so far on hysteretic Josephson junctions, we find a supercurrent peak whose maximum I(s max) increases as the temperature T decreases. The asymptotic T = 0 value of I(s max) agrees with the junction Ambegaokar-Baratoff critical current, as predicted by theory. |
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