Single-vortex-induced voltage steps in Josephson-junction arrays

Details Single-vortex-induced voltage steps in Josephson-junction arrays Single-vortex-induced voltage steps in Josephson-junction arrays

1996-12-26

arxiv.org/abs/cond-mat/9612230v2

J. Phys.: Condens. Matter 9 (1997) 1813

Physics

Condensed Matter

Superconductivity

10 pages double sided with figures included in the text. To appear in Journal of Physics, Condensed Matter

Scientific paper

10.1088/0953-8984/9/8/011

We have numerically and analytically studied ac+dc driven Josephson-junction arrays with a single vortex or with a single vortex-antivortex pair present. We find single-vortex steps in the voltage versus current characteristics (I-V) of the array. They correspond microscopically to a single vortex phase-locked to move a fixed number of plaquettes per period of the ac driving current. In underdamped arrays we find vortex motion period doubling on the steps. We observe subharmonic steps in both underdamped and overdamped arrays. We successfully compare these results with a phenomenological model of vortex motion with a nonlinear viscosity. The I-V of an array with a vortex-antivortex pair displays fractional voltage steps. A possible connection of these results to present day experiments is also discussed.

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