Title :
Au/YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// thin film composites on various substrates
Author :
Allen, L.H. ; Cukauskas, E.J.
Author_Institution :
Naval Res. Lab., Washington, DC, USA
fDate :
6/1/1997 12:00:00 AM
Abstract :
We have grown a series of composite films of Au with YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// on various substrates using a bilayer deposition technique to study their suitability for flux flow applications. The T/sub c/´s and J/sub c/´s were measured, and results compared with plain YBCO films for the different substrates. The patterning process resulted in some damage to the composites, but an oxygen plasma treatment was effective in restoring T/sub c/´s and resistance ratios, J/sub c/ measurements suggest that Au/YBCO composites behave like SNS-coupled arrays of superconducting grains. Their increased response to small magnetic fields is consistent with Josephson vortices dominating the transport. These findings indicate that Au/YBCO composites are a promising material for flux flow applications.
Keywords :
Josephson effect; barium compounds; critical current density (superconductivity); flux flow; gold; grain boundaries; high-temperature superconductors; superconducting thin films; superconducting transition temperature; yttrium compounds; Au-YBa/sub 2/Cu/sub 3/O/sub 7/; Au/YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// thin film composites; Josephson vortices; bilayer deposition technique; critical current density; critical temperature; flux flow applications; high temperature superconductor; superconducting grains; Composite materials; Electrical resistance measurement; Gold; Magnetic field measurement; Magnetic materials; Plasma applications; Plasma measurements; Plasma transport processes; Superconducting materials; Yttrium barium copper oxide;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
