Title
Observation of ultrahigh critical current densities in high-Tc superconducting bridge constrictions
Abstract
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.
Keywords
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
Disciplines
Electromagnetics and photonics
Publisher
American Physical Society
Publication Date
4-1-1991
Rights Information
Copyright 1991 American Physical Society
Rights Holder
American Physical Society
Permanent URL
Recommended Citation
Jiang, H.; Huang, Y.; How, H.; Zhang, S.; Vittoria, C.; Widom, A.; Chrisey, D. B.; Horwitz, J. S.; and Lee, R., "Observation of ultrahigh critical current densities in high-Tc superconducting bridge constrictions" (1991). Electrical and Computer Engineering Faculty Publications. Paper 98. http://hdl.handle.net/2047/d20002269
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Notes
Originally published in Physical Review Letters 66, 1785-1788 (1991). doi 10.1103/PhysRevLetters66.1785 (http://link.aps.org/doi/10.1103/PhysRevLetters66.1785).