The Post-Annealing Effect on the Pinning Properties of GdBa2Cu3O 7−δ Coated Conductors via RCE-DR

• Published in: IEEE transactions on applied superconductivity 2018-06, Vol.28 (4), p.1-5
• Main Authors: Oh, Won-Jae, Park, Insung, Lee, Jae-Hun, Lee, Hunju, Moon, Seung-Hyun, Shinde, Kiran, Chung, Kookchae, Yoo, Sang-Im
• Format: Article
• Language: English
• Subjects: Annealing; Critical current density <named-content xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" content-type="math" xlink:type="simple"> <inline-formula> <tex-math notation="LaTeX"> (J_c) </tex-math> </inline-formula> </named-content>; flux pinning; Furnaces; GdBa<named-content xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" content-type="math" xlink:type="simple"> <inline-formula> <tex-math notation="LaTeX"> _{2}\text{Cu}_3\text{O}_{7-\delta}</tex-math> </inline-formula> </named-content> (GdBCO); post-annealing process; reactive co-evaporation deposition and reaction (RCE-DR); Reflection; Temperature; Temperature measurement; X-ray scattering
• ISSN: 1051-8223; 1558-2515
• DOI: 10.1109/TASC.2018.2814057

We report the post-annealing effect on the pinning properties of GdBa 2 Cu 3 O 7-δ (GdBCO) coated conductors (CCs) fabricated by a reactive co-evaporation deposition and reaction process. The GdBCO CCs annealed at 750 °C in the PO 2 of 300 mtorr for 15 min show the most enhanced critical current densities (J c ) for B//c due to the stacking faults (SF) piled up along the c-axis. The minimum J c values of post-annealed samples in relatively higher fields such as 5 T at 77 K and 7 T at 65 K were larger than those of pristine sample; although their minimum J c values were lower in relatively lower fields such as 1 T at 77 K and 3 T at 65 K. In-field J c values for B//ab were closely related to the density of SFs within samples. Analysis results by transmission electron microscopy revealed that the SF density was remarkably reduced after the post-annealing process, which is responsible for enhanced minimum J c values and significantly degraded J c values for B//ab in relatively higher fields.