Frequency dependence of giant Shapiro steps in ordered and site-disordered proximity-coupled Josephson-junction arrays
K. Ravindran, L. B. Gómez, R. R. Li, S. T. Herbert, P. Lukens, Y. Jun, S. Elhamri, R. S. Newrock, D. B. Mast
DOI 10.1103/PhysRevB.53.5141 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
We present experimental results on the frequency dependence of the integer giant Shapiro steps on ordered and random site-disordered arrays of Nb-Au-Nb Josephson junctions. We find that the dependence of the Shapiro step heights upon the rf frequency follows the predictions of Octavio et al. for the resistively shunted junction model. We also find that increasing the disorder greatly suppresses the step heights and that at high frequencies the maximum step heights exhibit an extremely pronounced rolloff, in direct contrast to arrays with no disorder. The Shapiro steps for the site-disordered samples show significant voltage broadening which increases linearly with frequency. This behavior appears to be a unique feature in the site-disorder systems, which we qualitatively interpret as arising from current-induced vortices generated at the defect sites.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
Similar papers
Half-integer Shapiro steps in strong ferromagnetic Josephson junctions
similarity 0.96Yunyan Yao et al.
Source status unknown — claims are unverified
Charge transport through ultrasmall single and double Josephson junctions coupled to resonant modes of the electromagnetic environment
similarity 0.95Yu. A. Pashkin et al.
Source status unknown — claims are unverified
Tuning of phase diffusion in small Josephson junctions by magnetic field
similarity 0.95Y. Koval et al.
Source status unknown — claims are unverified
Josephson interferometry and Shapiro step measurements of superconductor-ferromagnet-superconductor 0−π junctions
similarity 0.95S. M. Frolov et al.
Source status unknown — claims are unverified
Superconducting transition of a two-dimensional Josephson junction array in weak magnetic fields
similarity 0.94In-Cheol Baek et al.
Source status unknown — claims are unverified
Collective cavity mode excitations in arrays of Josephson junctions
similarity 0.94I. Ottaviani et al.
Source status unknown — claims are unverified