Title :
Characterization of thin film composite mixtures of Y/sub 1/Ba/sub 2/Cu/sub 3/O/sub 7-/spl delta// and Y/sub 2/O/sub 3/
Author :
Broussard, P.R. ; Cestone, V.C. ; Allen, L.H.
Author_Institution :
Naval Res. Lab., Washington, DC, USA
fDate :
6/1/1995 12:00:00 AM
Abstract :
In our studies of the behavior of materials forming thin film composites with Y/sub 1/Ba/sub 2/Cu/sub 3/O/sub 7-/spl delta// (YBCO), we have characterized thin film composite mixtures of YBCO and Y/sub 2/O/sub 3/ (yttria) grown onto (100) MgO and (100) SrTiO/sub 3/ substrates by off-axis sputtering. We have examined the transport properties of the films, in particular the critical current density, J/sub c/. The temperature dependence of J/sub c/ for composites on SrTiO/sub 3/ is identical to that of our pure YBCO films, while for composites on MgO the J/sub c/ is similar to measurements on our earlier composites of YBCO and Y/sub 2/Ba/sub 1/Cu/sub 1/O/sub 5/ ("211"). The field dependence of J/sub c/ for the YBCO/yttria composites is different from our pure YBCO films, and from our earlier composites, but the magnitude of the flux pinning is similar.<>
Keywords :
barium compounds; composite superconductors; critical current density (superconductivity); flux pinning; high-temperature superconductors; sputtered coatings; superconducting thin films; yttrium compounds; MgO; SrTiO/sub 3/; Y/sub 1/Ba/sub 2/Cu/sub 3/O/sub 7-/spl delta//-Y/sub 2/O/sub 3/ composites; YBa/sub 2/Cu/sub 3/O/sub 7/-Y/sub 2/O/sub 3/; critical current density; field dependence; flux pinning; high temperature superconductors; off-axis sputtering; temperature dependence; thin film composite mixtures; transport properties; Composite materials; Conductivity; Current measurement; Density measurement; Magnetic field measurement; Sputtering; Substrates; Temperature measurement; Transistors; Yttrium barium copper oxide;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
