Development of In-Plume Pulsed Laser Deposition of High-Ic GdBCO Films for Coated Conductors

Abstract

We studied a feasibility of pulsed laser deposition technique (PLD) for high-rate deposition of high-Ic GdBa <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> Cu <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> O <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">y</sub> based films (GdBCO) with improved flux pinning characteristics. It was found that in-plume deposition (IP-PLD) of off-stoichiometric Ba-poor films at a high laser energy density combined with addition of BaZrO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> (BZO) is very helpful for suppression of critical current density (Jc) degradation vs film thickness. Very high Ic at 77.5 K in a range of 700-1000 A/cm was estimated in a self-field for short GdBCO samples deposited on Hastelloy/Gd <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> Zr <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> O <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">7</sub> /CeO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> substrates. The record high Ic of 135 A/cm in the magnetic field of 3 Tesla applied perpendicular to the film surface and minimal value of 100 A/cm in angular dependent I <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">c</sub> measurements were achieved on single-layer 5 microns thick GdBCO+BZO film.