Observation of ultrahigh critical current densities in high- T sub c superconducting bridge constrictions

Journal Article · Mon Apr 01 00:00:00 EST 1991 · Physical Review Letters; (USA)

DOI:https://doi.org/10.1103/PhysRevLett.66.1785· OSTI ID:5591735

Jiang, H; Huang, Y; How, H; Zhang, S; Vittoria, C ^[1]; Widom, A ^[2]; Chrisey, D B; Horwitz, J S ^[3]; Lee, R ^[4]

---

1. Department of Electrical Engineering, Northeastern University, Boston, Massachusetts 02115 (US)
2. Department of Physics, Northeastern University, Boston, Massachusetts 02115 (US)
3. Naval Research Laboratory, Washington, D.C. 20375 (US)
4. Micrion Corporation, One Corporation Way, Peabody, Massachusetts 01960 (US)

Narrow bridge structures were precisely fabricated (using novel ion-beam-milling techniques) on pulsed-laser-deposited YBa{sub 2}Cu{sub 3}O{sub 7} films. The bridges have a length scale down to {ital L}{congruent}500 A. Supercurrents were observed to flow across the bridge structures with critical current densities up to {ital J}{sub {ital c}}{congruent}1.3{times}10{sup 9} A/cm{sup 2}, 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 {xi}{much lt}{ital L}{le}{Lambda}, with {xi} the coherence length and {Lambda} the London penetration depth. The highest {ital J}{sub {ital c}} is in good agreement with the critical depairing mechanism.

• OSTI ID: 5591735
• Journal Information: Physical Review Letters; (USA), Vol. 66:13; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BARIUM OXIDES
CRITICAL CURRENT
COPPER OXIDES
ELECTRIC BRIDGES
YTTRIUM OXIDES
COHERENCE LENGTH
CORRELATIONS
DEPOSITION
ELECTRIC CONDUCTIVITY
EXPERIMENTAL DATA
FABRICATION
HIGH-TC SUPERCONDUCTORS
ION BEAMS
LASERS
LONDON EQUATION
LOW TEMPERATURE
MILLING
ONSAGER RELATIONS
PENETRATION DEPTH
SUPERCONDUCTING FILMS
TEMPERATURE DEPENDENCE
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BEAMS
CHALCOGENIDES
COPPER COMPOUNDS
CURRENTS
DATA
DIMENSIONS
ELECTRIC CURRENTS
ELECTRICAL EQUIPMENT
ELECTRICAL PROPERTIES
EQUATIONS
EQUIPMENT
FILMS
INFORMATION
LENGTH
MACHINING
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
360204* - Ceramics
Cermets
& Refractories- Physical Properties
426001 - Engineering- Superconducting Devices & Circuits- (1990-)