Discrete Josephson transmission lines based upon proximity effect bridges have been made by photoresist and anodization techniques. They are composed of 2-9 weak links conected in parallel.
Several peaks and steplike structures occur in their differential resistance-current (d
V/d
I-
I) characteristics. It was discussed in a Stewart-McCumber equivalent circuit by means of numerical analysis. The quantum interference properties of these lines are found both in critical current-applied magnetic field (
Ic-
H) characteristics and in d
V/d
H-
H characteristics at constant applied current. The observed periodicities in both characteristics are in very good agreement. Over a certain range of temperatures, quantum-interference patterns similar to the
N-slit diffraction patterns in optics were obtained for these lines containing
N weak links, indi-cating that all of the weak links contained in these lines were operating.
The velocities of the flux flow in these transmission lines were obtained from voltage-applied magnetic field (
V-
H) characteristics.
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