Flux flow and vortex tunneling in two-dimensional arrays of small Josephson junctions

Journal Article · Tue Oct 01 04:00:00 EDT 1996 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.54.9449· OSTI ID:383848

Chen, C D; Delsing, P; Haviland, D B; Harada, Y; Claeson, T ^[1]

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1. Department of Physics, Chalmers University of Technology and University of Goeteborg, 412 96 Goeteborg (Sweden)

We have measured the temperature dependence and magnetic field dependence of the zero-bias resistance ({ital R}{sub 0}) as well as the current-voltage ({ital I}-{ital V}) characteristics for several two-dimensional arrays of small aluminum Josephson junctions. {ital R}{sub 0}({ital T}) decreases with decreasing temperature, which can be described in terms of two types of vortex motion: flux, flow, and vortex tunneling. At temperatures higher than the Kosterlitz-Thouless transition temperature ({ital T}{gt}{ital T}{sub {ital c}}) or at a bias current greater than the current corresponding to the onset of the nonlinear {ital I}-{ital V} characteristics ({ital I}{gt}{ital I}{sub {ital d}}), the effective damping resistance which characterizes flux-flow motion is found to be approximately equal to the junction normal-state resistance {ital R}{sub {ital N}}. At low temperatures and at small bias current, {ital R}{sub 0} is temperature independent and remains finite down to our minimum attainable temperature. This finite resistance is found to be dependent on the array size as well as the junction parameters. {copyright} {ital 1996 The American Physical Society.}

• OSTI ID: 383848
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 13 Vol. 54; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ACTIVATION ENERGY
ALUMINIUM
ELECTRIC CONDUCTIVITY
IV CHARACTERISTIC
JOSEPHSON JUNCTIONS
KOSTERLITZ-THOULESS THEORY
MAGNETIC FIELD EFFECTS
MAGNETIC FLUX
TEMPERATURE DEPENDENCE
TUNNEL EFFECT