Annealing Temperature Effects on ${\rm YBCO/LaAlO}_{3}$ and ${\rm YBCO/CeO}_{2}/{\rm Al}_{2}{\rm O}_{3}$ for Microwave Applications by TFA-MOD

YBa
₂
Cu
₃
O
_7-x
(YBCO) superconducting films can be used for microwave applications due to their low surface resistance. Both LaAlO
₃
and Al
₂
O
₃
can be considered as applicable substrates since their excellent properties for the preparation of high-quality YBCO films and for the design of microwave elements. In order to optimize the annealing temperature, the microstructure and properties were investigated for YBCO/LaAlO
₃
and YBCO/CeO
₂
/r-cut Al
₂
O
₃
films prepared by trifluoroacetates metal organic deposition (TFA-MOD). The results show that the annealing temperature window is broader for YBCO films on LaAlO
₃
substrates; while, the window is relative narrower for YBCO films on CeO
₂
/Al
₂
O
₃
substrates. The reasons were also discussed. The surface resistivity (R
_s
) was measured for the samples with highest critical current density (J
_c
). The results will provide useful information about processing effects on YBCO films using TFA-MOD for microwave applications.