Experimental Observation of Fluxon Diffusion in Josephson Rings
| Autor: | Juan J. Mazo, Nikhil J. Fernandes, Kenneth Segall, Adam Dioguardi |
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| Rok vydání: | 2008 |
| Předmět: |
Physics
Josephson effect Work (thermodynamics) Fluxon Condensed matter physics Dissipation Condensed Matter Physics Atomic and Molecular Physics and Optics Pi Josephson junction Condensed Matter::Superconductivity General Materials Science Current (fluid) Diffusion (business) Nonlinear Sciences::Pattern Formation and Solitons Voltage |
| Zdroj: | Journal of Low Temperature Physics. 154:41-54 |
| ISSN: | 1573-7357 0022-2291 |
| DOI: | 10.1007/s10909-008-9849-8 |
| Popis: | We 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 (∼400 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. |
| Databáze: | OpenAIRE |
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