Current-voltage characteristic of a Josephson junction with randomly distributed Abrikosov vortices

Journal Article · Tue Jul 01 04:00:00 EDT 1997 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.56.788· OSTI ID:531825

Fistul, M V; Giuliani, G F ^[1]

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1. Department of Physics, 1396 Physics Building, Purdue University, West Lafayette, Indiana 47907-1396 (United States)

We have developed a theory of the current-voltage characteristic of a Josephson junction in the presence of randomly distributed, pinned misaligned Abrikosov vortices oriented perpendicularly to the junction plane. Under these conditions the Josephson phase difference {var_phi} acquires an interesting stochastic dependence on the position in the plane of the junction. In this situation it is possible to define an average critical current which is determined by the spatial correlations of this function. Due to the inhomogeneity, we find that for finite voltage bias the electromagnetic waves propagating in the junction display a broad spectrum of wavelengths. This is at variance with the situation encountered in homogeneous junctions. The amplitude of these modes is found to decrease as the bias is increased. We predict that the presence of these excitations is directly related to a remarkable feature in the current-voltage characteristic. The dependence of the position and the magnitude of this feature on the vortex concentration has been determined. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 531825
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 2 Vol. 56; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ABRIKOSOV THEORY
CRITICAL CURRENT
ELECTRIC CONDUCTIVITY
JOSEPHSON EFFECT
JOSEPHSON JUNCTIONS
MAGNETIC FLUX
VORTICES