Vortex Motion and Vortex Friction Coefficient in Triangular Josephson Junction Arrays

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dc.creatorWenbin
dc.creatorStroud, David G.
dc.date1993-12-12
dc.date.accessioned2026-07-07T03:07:01Z
dc.date.available2026-07-07T03:07:01Z
dc.descriptionThe dynamical response of triangular JJA is investigated using the RCSJ model. A flux flow regime is found to extend between a lower vortex-depinning current and a higher critical current, in agreement with previous calculations for square arrays. In the flux flow regime, the dynamical response to the bias current is roughly Ohmic, and the time-dependent voltage can be well understood in terms of vortex degrees of freedom. The vortex friction coefficient $η$ depends strongly on the McCumber-Stewart parameter $β$, and at large $β$ is approximately independent of the shunt resistance $R$. To account for this, we generalize a model of Geigenmüller {\it et al} to treat energy loss from moving vortices to the phase analog of optical spin waves in a triangular lattice. The value of $η$ at all values of $β$ agrees quite well with this model in the low-density limit. The vortex depinning current is estimated as $0.042I_c$, independent of the direction of applied current, in agreement with static calculations by Lobb {\it et al}. A simple argument suggests that quantum effects in vortex motion may become important when the flux flow resistivity is of order $h/(2e)^2$ per unit frustration.
dc.description12 pages + 14 figures, REVTeX 3.0, will be published in Phys. Rev. B
dc.identifierhttps://arxiv.org/abs/cond-mat/9312047
dc.identifierhttp://arxiv.org/abs/cond-mat/9312047
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/27026
dc.subjectCondensed Matter
dc.titleVortex Motion and Vortex Friction Coefficient in Triangular Josephson Junction Arrays
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