Switching Current Measurements in Josephson Rings

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dc.creatorSegall, K.
dc.creatorDioguardi, A.
dc.creatorFernandes, N.
dc.creatorMazo, J. J.
dc.date2008-07-18
dc.date.accessioned2026-07-07T09:51:19Z
dc.date.available2026-07-07T09:51:19Z
dc.descriptionWe present switching current measurements in niobium-aluminum oxide-niobium underdamped Josephson rings. Underdamped Josephson rings display hysteretic current-voltage curves which can be characterized by their switching current, the value of applied current at which the junctions switch to the energy-gap voltage. The value of the switching current is strongly affected by temperature and by the presence of fluxons in the system. We observe a very small voltage (0.2 nV) across the ring prior to switching, indicating a low-velocity fluxon diffusion state before the jump to a full running state. In analogy with previous work on single junctions, we analyze the switching current data with the process of thermal activation over a dissipation barrier, where the system switches from a low velocity state to a high velocity state. We find that our data agrees qualitatively with this description, further supporting the observation of fluxon diffusion.
dc.description18 pages, 10 figures, submitted to Journal of Low Temperature Physics
dc.identifierhttps://arxiv.org/abs/0807.2978
dc.identifierhttp://arxiv.org/abs/0807.2978
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/165247
dc.subjectSuperconductivity
dc.titleSwitching Current Measurements in Josephson Rings
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