Generation of subharmonic shapiro steps in ladder arrays of overdamped superconducting junctions

We report the measurement and analysis of critical current (Ic) modulation and microwave response in magnetic field for a set of YBa2Cu3O7-YBa2Co0.15Cu2.85O7-YBa2Cu 3O7 ramp-edge Josephson junctions. These junctions have been fabricated with various widths w to span the transition from the moderately small (w<2λJ) to the moderately large (w>2λJ) junction limit at 77 K. As w increases, both the Ic modulation and microwave absorption behavior independently suggest a growing contribution from edge supercurrents. The addition of a superconducting ground plane was shown to reduce the edge supercurrent effects.

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Supercurrent distributions and flux penetration in YBa2Cu3O7–YBa2C o0.15Cu2.85O7–YBa2Cu3O7 edge junctions

Gausepohl

Lee

Berkowitz

et al. 1997

Journal of Applied Physics

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Devil Staircase Dynamic in Arrays of Overdamped Josephson Junctions

1995

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The domains of dynamical coherence (i.e. the Shapiro step-plateaus) observable when an array of overdamped Josephson junctions is subjected to an external periodic perturbation, can be strongly modified by the presence of both the disorder and the frustration, f. In particular, by varying the value off it is possible to induce a reduction in the width of the integer giant Shapiro step-plateaus (corresponding to a compression of the attraction basin of the main locked states of the system) and the progressive appearance of a subharmonic devil staircase characterized by a fractal dimension, D = 0.88, value that agrees with what has been observed for other complex systems. The sensitivity of the I-V characteristics to f is mirrored in the complexity of the dynamical phase space composed by phase-locked domains separated by regions of chaotic dynamics.

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Generation of subharmonic shapiro steps in ladder arrays of overdamped superconducting junctions

Cited by 2 publications

References 9 publications

Supercurrent distributions and flux penetration in YBa2Cu3O7–YBa2C o0.15Cu2.85O7–YBa2Cu3O7 edge junctions

Supercurrent distributions and flux penetration in YBa2Cu3O7–YBa2C o0.15Cu2.85O7–YBa2Cu3O7 edge junctions

Devil Staircase Dynamic in Arrays of Overdamped Josephson Junctions

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