Abstract
We developed an inside-plume pulsed laser deposition (IP-PLD) technique which has enabled high-rate fabrication of Gd-Ba-Cu-O (GdBCO) tapes with improved transport current capability. The main idea of the IP-PLD technique is to increase the deposition rate simply by reducing the substrate-to-target (ST) distance and to employ very high laser energy density, >0.035 J/mm 2. As a result, the production rate increased up to about three times higher than that for the conventional PLD method. We also showed that the IP-PLD requires appropriate adjustment of the target composition to obtain an optimal composition in the tape. By optimizing the target composition and adding BaZrO 3 pinning centers, we obtained very high I c values at 77 K of 700–1000 A/cm-w (s.f.) and 135 A/cm-w ( B = 3 T ( B‖ c)) for short samples with an about 5 μm-thick GdBCO layer.
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