Title :
High-T/sub c/ SNS edge junctions with integrated YBa/sub 2/Cu/sub 3/O/sub x/ groundplanes
Author :
Hunt, B.D. ; Forrester, M.G. ; Talvacchio, J. ; Young, R.M. ; McCambridge, J.D.
Author_Institution :
Northrop Grumman Sci. & Technol. Center, Pittsburgh, PA, USA
fDate :
6/1/1997 12:00:00 AM
Abstract :
We have fabricated high-T/sub c/ SNS weak links in an edge geometry with integrated YBa/sub 2/Cu/sub 3/O/sub x/ (YBCO) groundplanes and SrTiO/sub 3/ insulators, using a process which incorporates six epitaxial layers, including a Co-doped-YBCO normal-metal interlayer. The SNS edge junctions were produced using films deposited by both off-axis sputtering and pulsed laser deposition. These devices exhibit tight J/sub c/ spreads and high I/sub c/R/sub n/ products in a current density regime well-suited for SFQ circuit fabrication. We also describe results on SNS junctions fabricated in a novel "slot" geometry, designed to reduce junction and interconnect inductances.
Keywords :
Josephson effect; barium compounds; critical current density (superconductivity); high-temperature superconductors; pulsed laser deposition; sputter deposition; superconducting epitaxial layers; superconducting junction devices; yttrium compounds; Co-doped-YBCO normal-metal interlayer; SFQ circuit; SrTiO/sub 3/; SrTiO/sub 3/ insulator; YBa/sub 2/Cu/sub 3/O; YBaCuO:Co; critical current density; critical current normal resistance product; epitaxial layer; fabrication; film; high-T/sub c/ SNS edge junction; inductance; integrated YBa/sub 2/Cu/sub 3/O/sub x/ groundplane; off-axis sputtering; pulsed laser deposition; slot geometry; weak link; Circuits; Current density; Epitaxial layers; Geometry; Insulation; Optical device fabrication; Optical pulses; Pulsed laser deposition; Sputtering; Yttrium barium copper oxide;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
