Critical currents for vortex defect motion in superconducting arrays

Details Critical currents for vortex defect motion in superconducting arrays Critical currents for vortex defect motion in superconducting arrays

2005-03-15

arxiv.org/abs/cond-mat/0503361v1

Physics

Condensed Matter

Statistical Mechanics

To appear in Physical Review B

Scientific paper

10.1103/PhysRevB.71.100505

We study numerically the motion of vortices in two-dimensional arrays of resistively shunted Josephson junctions. An extra vortex is created in the ground states by introducing novel boundary conditions and made mobile by applying external currents. We then measure critical currents and the corresponding pinning energy barriers to vortex motion, which in the unfrustrated case agree well with previous theoretical and experimental findings. In the fully frustrated case our results also give good agreement with experimental ones, in sharp contrast with the existing theoretical prediction. A physical explanation is provided in relation with the vortex motion observed in simulations.

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