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We show that shunt capacitor stabilizes synchronized oscillations inintrinsic Josephson junction stacks biased by DC current. This synchronizationmechanism has an effect similar to the previously discussed radiative couplingbetween junctions, however, it is not defined by the geometry of the stack. Itis particularly important in crystals with smaller number of junctions, whereradiation coupling is week, and is comparable with the effect of strongsuper-radiation in crystal with many junctions. The shunt also helps to enterthe phase-locked regime in the beginning of oscillations, after switching onthe bias current. Shunt may be used to tune radiation power, which drops asshunt capacitance increases.

Shunt-capacitor-assisted synchronization of oscillations in intrinsic Josephson junctions stack