Physics – Condensed Matter – Superconductivity
Scientific paper
2005-03-30
Physical Review Letters Volume: 96 Issue: 18 Article Number: 180604 (2006)
Physics
Condensed Matter
Superconductivity
Four pages, one figure
Scientific paper
10.1103/PhysRevLett.96.180604
New scaling behavior has been both predicted and observed in the spontaneous production of fluxons in quenched $Nb-Al/Al_{ox}/Nb$ annular Josephson tunnel junctions as a function of the quench time, $\tau_{Q}$. The probability $f_{1}$ to trap a single defect during the N-S phase transition clearly follows an allometric dependence on $\tau_{Q}$ with a scaling exponent $\sigma = 0.5$, as predicted from the Zurek-Kibble mechanism for {\it realistic} JTJs formed by strongly coupled superconductors. This definitive experiment replaces one reported by us earlier, in which an idealised model was used that predicted $\sigma = 0.25$, 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.
Aaroe M.
Koshelets Valery. P.
Monaco Roberto
Mygind Jesper
Rivers Ray J.
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