Preparation of Trifluoroacetate Metal Organic Deposition Derived REBa2Cu3Oy Thin Film With High-Jc and Low-Rs for High-Power High-Temperature Superconducting Transmit Filters

A trifluoroacetate metal-organic deposition (TFA-MOD) derived (Y
_0.77
Gd
_0.23
)Ba
₂
Cu
₃
O
_y
[(Y,Gd)BCO] thin film was prepared on an annealed CeO
₂
-buffered
R
-Al
₂
O
₃
substrate (25 × 25 mm) for high-power high-temperature superconducting (HTS) transmit filter. The fluctuation of the superconducting transition temperature (
T
_c
) and the self-field critical current density (
${J}_{\mathrm{c}}^{\text{sf}}$
) were small, which indicated a uniform thin film. The (Y,Gd)BCO thin film showed high
${J}_{\mathrm{c}}^{\text{sf}}$
and low surface resistance (
R
_s
). The average
${J}_{\mathrm{c}}^{\text{sf}}$
at 77 K and
R
_s
(21.8 GHz) at 77 K were 8.9 MA/cm
²
and 2.3 mΩ, respectively. The TFA-MOD derived (Y,Gd)BCO thin film on an annealed CeO
₂
-buffered
R
-Al
₂
O
₃
substrate is thus a promising candidate material for high-power HTS transmit filters.