Zurek-Kibble Mechanism for the Spontaneous Vortex Formation in Nb−Al/Alox/Nb Josephson Tunnel Junctions: New Theory and Experiment
R. Monaco, J. Mygind, M. Aaroe, R. J. Rivers, V. P. Koshelets
DOI 10.1103/PhysRevLett.96.180604 · Physical Review Letters
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Abstract
New scaling behavior has been both predicted and observed in the spontaneous production of fluxons in quenched Nb−Al/Alox/Nb annular Josephson tunnel junctions (JTJs) as a function of the quench time, τQ. The probability f1 to trap a single defect during the normal-metal–superconductor phase transition clearly follows an allometric dependence on τQ with a scaling exponent σ=0.5, as predicted from the Zurek-Kibble mechanism for realistic JTJs formed by strongly coupled superconductors. This definitive experiment replaces one reported by us earlier, in which an idealized model was used that predicted σ=0.25, commensurate with the then much poorer data. Our experiment remains the only condensed matter experiment to date to have measured a scaling exponent with any reliability.
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 |
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