Title :
MOCVD and MOD of YBCO and Buffer Layers on Textured Metal Tapes
Author :
Stadel, Oliver ; Muydinov, Ruslan Yu ; Bräuer, Günter ; Rikel, Mark O. ; Ehrenberg, Jürgen ; Bock, Joachim ; Kotzyba, Gunter ; Nast, Rainer ; Goldacker, Wilfried ; Samoylenkov, Sergej V. ; Kaul, Andrej R.
Author_Institution :
PerCoTech AG, Braunschweig, Germany
fDate :
6/1/2009 12:00:00 AM
Abstract :
Different layer architectures produced by only MOD, only MOCVD and combinations of MOD buffers and MOCVD YBCO are presented. RTR MOCVD-YBCO layers obtained on MOD-CeO2/MOD-LZO/Ni5 at%W tapes demonstrate critical current densities up to 2 MA/cm2 at 77 K. On single LZO (50-100 nm) buffered Ni5 at%W tapes from Nexans Superconductors and on RTR MOCVD buffer layers critical current densities between 0.8 and 1.3 MA/cm are obtained. RTR MOD-LZO layers often show delamination during YBCO deposition. Preannealing treatment before YBCO deposition allows to avoid this. Tapes up to 10 m are produced by combination of MOD-LZO and RTR MOCVD-YBCO.
Keywords :
MOCVD; annealing; barium compounds; buffer layers; cerium compounds; critical current density (superconductivity); delamination; high-temperature superconductors; lanthanum compounds; nickel alloys; superconducting thin films; texture; tungsten alloys; yttrium compounds; MOCVD; Nexans superconductors; NiW; RTR MOD-LZO layers; YBa2Cu3O7-delta-CeO2-La2Zr2O7-NiW; buffer layers; critical current density; delamination; preannealing treatment; size 50 nm to 100 nm; superconducting thin films; temperature 77 K; textured metal tapes; Coated conductor; MOCVD; MOD; RABiTS;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2009.2018736
