Abstract
We have developed RE-123 (RE: rare earth element) thin films using pulsed laser deposition (PLD) method, and adopted HoBa 2Cu 3O y (HoBCO) as a RE-123 superconducting layer. HoBCO shows stable and high critical current density ( J c) over 3 MA/cm 2 in the case deposited on single crystal substrates such as sapphire and LAO. In this work, based on our PLD technique, HoBCO coated conductors have been developed on flexible metal textured substrates. Structure of oxide multi-buffer layers was investigated and fine crystal orientation of delta phi value below 10° was obtained by hetero-epitaxial growth. Furthermore, 10 m long multi-buffer tape was fabricated by continuous reel-to-reel system, and the uniformity of crystal alignment and surface flatness was confirmed. Fabricated HoBCO tape also showed excellent in-plane alignment and smooth surface morphology. J c at 77 K, in self-field of HoBCO superconducting films were around 1 MA/cm 2.
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