Observation of ultrahigh critical current densities in high-Tc superconducting bridge constrictions
H. Jiang, Y. Huang, H. How, S. Zhang, C. Vittoria, A. Widom, D. B. Chrisey, J. S. Horwitz, R. Lee
DOI 10.1103/PhysRevLett.66.1785 · Physical Review Letters
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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. Supercurrents were observed to flow across the bridge structures with critical current densities up to Jc≃1.3×109 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 ξ≪L≤Λ, with ξ the coherence length and Λ the London penetration depth. The highest Jc is in good agreement with the critical depairing mechanism.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | onset |
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