Title :
Thin film composites of Au and YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta//
Author :
Allen, L.H. ; Cukauskas, E.J. ; Fisher, M.A.
Author_Institution :
Naval Res. Lab., Washington, DC, USA
fDate :
6/1/1995 12:00:00 AM
Abstract :
We are using a novel bilayer deposition process to grow composite films of Au with YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta//. The composites have well-separated regions of Au and YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta//, and we see no evidence for structural or chemical degradation of the grains and grain boundaries. For composite films on MgO substrates, the transport properties indicate the presence of weakened superconductivity in the films. Composites on SrTiO/sub 3/ and LaAlO/sub 3/ do not show this as strongly. The MgO composites behave like arrays of Josephson junctions and show promise as materials for flux flow devices.<>
Keywords :
Josephson effect; barium compounds; composite superconductors; flux flow; gold; grain boundaries; high-temperature superconductors; sputter deposition; superconducting thin films; yttrium compounds; Au-YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// composites; Au-YBa/sub 2/Cu/sub 3/O/sub 7/; Josephson junction arrays; LaAlO/sub 3/; MgO; SrTiO/sub 3/; bilayer deposition; chemical degradation; composite films growth; flux flow devices; grain boundaries; high temperature superconductors; sputter deposition; structural degradation; thin film composites; transport properties; weakened superconductivity; well-separated regions; Chemicals; Composite materials; Degradation; Gold; Grain boundaries; Josephson junctions; Substrates; Superconducting films; Superconductivity; Transistors;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
