RARE EARTH-TYPE TAPE-SHAPED OXIDE SUPERCONDUCTOR, AND COMPOSITE SUBSTRATE USING THE OXIDE SUPERCOND

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This invention provides a rare earth-type tape-shaped oxide superconductor having excellent mechanical strength and superconducting properties and a composite substrate using the oxide superconductor. Nonoriented and nonmagnetic Ni-9 at% W alloy tapes (11, 21) were bonded onto both sides of a nonoriented and nonmagnetic hastelloy tape (100) by a normal temperature bonding process, and an Ni-3 at% W alloy tape (12) having a cubic texture was bonded onto the surface of the tape (11) by a normal temperature bonding process. Thereafter, the assembly is then heat treated in a reducing atmosphere to form a bonding layer (50a) and the like on the adhesive interface of each layer. Next, a (Ce, Gd)O2 intermediate layer (13) and a Ce2Zr2O7 intermediate layer (14) by an MOD process, a CeO2 intermediate layer (15), a YBCO superconducting film (16) by a TFA-MOD method, and a silver stabilization layer (17) were stacked in that order on the surface of the tape (12). This superconductor had a critical current value (Ic) of 150 A.