Using a new substrate produced by depositing a
self-epitaxial CeO
2 cap layer with a pulsed laser deposition (PLD) method on a Gd
2Zr
2O
7 (GZO) buffered Hastelloy tape, which was applied using the ion-beam assisted deposition (IBAD) method, YBa
2Cu
3O
7-δ (YBCO) layers by the PLD method were studied in terms of the delta phi (Δφ), Ra values, amount of existing a-axis oriented crystals, and the critical current,
Ic, values of the YBCO coated conductors. To obtain a YBCO coated conductor with high
Ic, good in-plane texturing of the CeO
2 layer is required. The values of
Ic were saturated at a certain critical YBCO thickness, which is thicker with a better Δφ of the CeO
2 layer. As the YBCO layer thickness increased, the surface morphology became much rougher. Consequently the surface temperature of the YBCO layer fell and the amount of a-axis oriented crystals in the YBCO increased. To solve this problem, we fabricated YBCO films by multi-layer deposition using the Reel-to-Reel system, which was carried out at different temperatures settings and thus the values of
Ic increased.
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