Title :
Deposition of barium potassium bismuth oxide (BKBO) thin films by laser ablation
Author :
Lacoe, R.C. ; Wendt, J.P. ; Adams, P.M.
Author_Institution :
Aerospace Corp., Los Angeles, CA, USA
fDate :
3/1/1993 12:00:00 AM
Abstract :
High-transition-temperature barium potassium bismuth oxide (BKBO) thin films have been deposited by pulsed-laser ablation. The best results were obtained by ablating from a potassium-rich single target in a pure argon background onto [100] SrTiO/sub 3/ substrates. Films with superconducting onset and zero-resistance temperatures of 28.5 and 27.5 K, respectively, were routinely obtained, with room-temperature resistivity as low as 250 mu Omega -cm. X-ray diffraction analysis showed the films were single crystal and epitaxially oriented in the [100] direction. X-ray rocking curves of the BKBO [200] reflection revealed a full width at half maximum of approximately 0.7 degrees Delta theta and indicated that the BKBO [100] lattice direction was misoriented with respect to that of the SrTiO/sub 3/ substrate by 0.13 degrees .<>
Keywords :
X-ray diffraction examination of materials; barium compounds; high-temperature superconductors; potassium compounds; pulsed laser deposition; superconducting epitaxial layers; superconducting transition temperature; 27.5 K; 28.5 K; Ba/sub 1-x/K/sub x/BiO/sub 3/; SrTiO/sub 3/ substrates; X-ray diffraction analysis; X-ray rocking curves; [100] direction; [200] reflection; epitaxially oriented; full width at half maximum; high transition temperature; pulsed-laser ablation; pure Ar background; room-temperature resistivity; single crystal; superconducting onset temperature; zero-resistance temperatures; Argon; Barium; Bismuth; Optical films; Sputtering; Substrates; Superconducting epitaxial layers; Superconducting films; Superconducting thin films; Temperature;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
