Abstract
The preparation of long oxide template using surface-oxidation epitaxy (SOE) method and the deposition of oxide cap layer and YBa 2Cu 3O 7− δ (YBCO) film on it have been studied for the fabrication of coated conductors. In SOE process, Cr-oxide behaves as a barrier against Cr contamination with SOE-NiO layer in high strength and low magnetism Ni-clad Ni–20wt.%Cr (Ni/NiCr) tape. MgO cap layer makes SOE-processed tape surface smooth with the average roughness of a few nm. The critical current ( I c) of 8 A (the critical current density ( J c) of 0.2 MA/cm 2) was obtained for the YBCO film deposited on a 10 cm long×5 mm width SOE-processed tape with MgO cap layer in a short sample cut from a 10 cm long specimen. J c exceeding 0.1 MA/cm 2 was obtained for YBCO film on SrTiO 3 cap layer and CeO 2 one of SOE-processed tape.
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