Critical current from dynamical boundary instability for fully frustrated Josephson junction arrays

Details Critical current from dynamical boundary instability for fully frustrated Josephson junction arrays Critical current from dynamical boundary instability for fully frustrated Josephson junction arrays

1999-12-17

arxiv.org/abs/cond-mat/9912326v2

Phys. Rev. B 61, 7017 (2000)

Physics

Condensed Matter

Superconductivity

5 pages, 5 figures, in two columns, final version

Scientific paper

10.1103/PhysRevB.61.7017

We investigate numerically the critical current of two-dimensional fully frustrated arrays of resistively shunted Josephson junctions at zero temperature. It is shown that a domino-type mechanism is responsible for the existence of a critical current lower than the one predicted from the translationally invariant flux lattice. This domino mechanism is demonstrated for uniform-current injection as well as for various busbar conditions. It is also found that inhomogeneities close to the contacts makes it harder for the domino propagation to start, which increases the critical current towards the value based on the translational invariance. This domino-type vortex motion can be observed in experiments as voltage pulses propagating from the contacts through the array.

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