Physics – Condensed Matter
Scientific paper
1995-02-13
Physics
Condensed Matter
26 pages, REVTEX, 9 PS figures appended in uuencoded form at the end, submitted to Phys. Rev. B.
Scientific paper
10.1103/PhysRevB.52.7504
Within the RSJ model, we performed a theoretical analysis of phase-locking in elementary strongly coupled Josephson junction cells. For this purpose, we developed a systematic method allowing the investigation of phase-locking in cells with small but non-vanishing loop inductance.The voltages across the junctions are found to be locked with very small phase difference for almost all values of external flux. However, the general behavior of phase-locking is found to be just contrary to that according to weak coupling. In case of strong coupling there is nearly no influence of external magnetic flux on the phases, but the locking-frequency becomes flux-dependent. The influence of parameter splitting is considered as well as the effect of small capacitive shunting of the junctions. Strongly coupled cells show synchronization even for large parameter splitting. Finally, a study of the behavior under external microwave radiation shows that the frequency locking-range becomes strongly flux-dependent, whereas the locking frequency itself turns out to be flux-independent.
Basler Michael
Krech Wolfram
Platov Konstantin Yu.
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