Narrow bridge structures were precisely fabricated (using novel ion-beam-milling techniques) on pulsed-laser-deposited YBa₂Cu₃O₇ films. The bridges have a length scale down to L ≃500 Å. Super-currents were observed to flow across the bridge structures with critical current densities up to Jc ≃1.3 x 109 A/cm², the highest critical current densities yet reported. The current-density magnitudes are consistent with the Onsager-Feynman vortex-ring-creation mechanism (for producing voltages across narrow constrictions) in the length scale region of ζ << L ≤Λ, with ζ the coherence length and Λ the London penetration depth. The highest Jc is in good agreement with the critical depairing mechanism.


Originally published in Physical Review Letters 66, 1785-1788 (1991). doi 10.1103/PhysRevLetters66.1785 (http://link.aps.org/doi/10.1103/PhysRevLetters66.1785).


narrow bridge structures, ultrahigh critical current densities, high-Tc superconducting bridge constrictions, YBa₂Cu₃O₇, Onsager Feynman vortex ring creation mechanism

Subject Categories

Thin films, Superconductors, Pulsed laser deposition


Electromagnetics and photonics


American Physical Society

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Copyright 1991 American Physical Society

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American Physical Society

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