$J_{\rm c}-B$ Properties of ${\rm YBa}_{2}{\rm Cu}_{3}{\rm O}_{7}$ Films Prepared on ${\rm CeO}_{2}/{\rm YSZ/CeO}_{2}$ Buffered Ni-Electroplated Cu Tapes

The Cu substrates have the advantages of no ferromagnetic contribution to hysteretic AC losses, and low cost compared to Ni substrates. We investigated the J
_c
-B properties of YBCO films deposited on the cube-textured Cu tapes with intervening buffer layers. A protective Ni overlayer was added on top of the cube-textured Cu tape by electroplating to reduce the oxidation rate of the Cu substrate. The YBCO films prepared on the CeO
₂
/YSZ/CeO
₂
buffered Ni-electroplated Cu tapes revealed the transport J
_c
exceeding 3.6 MA/cm
²
at 77 K in a self-field. We also confirmed that our Ni-electroplated Cu tape lost its ferromagnetism after 700degC times 1 hour heat treatment.