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Fluxon propagation, zero‐field steps, and microwave radiation in very long Josephson tunnel junctions

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2 Author(s)
Erne, S.N. ; Physikalisch‐Technische Bundesanstalt, Institut Berlin, 1000 Berlin 10, West Germany ; Parmentier, R.D.

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Resonant propagation of two fluxons on an overlap‐geometry Josephson tunnel junction of length 10l, having a McCumber bc = 5r is studied by numerical integration of the circuit equations of a 100‐section lumped resistive shunted junction type (RSJ) model. Two different modes of propagation are observed: a symmetric fluxon‐antifluxon mode and an asymmetric fluxon‐fluxon mode. Which mode is stable depends on the value of the bias current. The existence of these two modes gives rise to a fine structure in the second zero‐field step in the dc current‐voltage characteristic of the junctions and to very different power spectra of the associated radiation emitted from the junction.

Published in:

Journal of Applied Physics  (Volume:52 ,  Issue: 2 )