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600 GHz resonant mode in a parallel array of Josephson tunnel junctions connected by superconducting microstrip lines

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4 Author(s)
Kaplunenko, V.K. ; Chalmers Univ. of Technol., Goteborg, Sweden ; Larsen, B.H. ; Mygind, J. ; Pedersen, N.F.

The high frequency properties of the one-dimensional transmission line consisting of a parallel array of resistively shunted Josephson tunnel junctions have been studied in the limit of relatively low damping where this nonlinear system exhibits new and interesting phenomena. Here we report on experimental investigations of a resonant step observed at a voltage corresponding to 600 GHz in the dc current-voltage characteristic of a parallel array of 20 identical small NbAlO/sub x/Nb Josephson junctions interconnected by short sections of superconducting microstrip line. The junctions are mutually phase locked due to collective interaction with the line sections excited close to the half wavelength resonance. The phase locking range can be adjusted by means of an external dc magnetic field and the step size varies periodically with the magnetic field.<>

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Applied Superconductivity, IEEE Transactions on  (Volume:5 ,  Issue: 2 )