[7p-S43-1~17] 11.2 Thin and thick superconducting films, coated conductors and film crystal growth

△ [7p-S43-7] Improved superconducting properties of fluorine-free MOD YBCO films by Br-addition

〇Takanori Motoki^1,4, Shuhei Ikeda¹, Shin-ichi Nakamura¹, Toshiya Doi^2,4, Genki Honda³, Tatsuoki Nagaishi³, Jun-ichi Shimoyama^1,4 (1.Aoyama-Gakuin Univ., 2.Kyoto Univ., 3.SEI, 4.JST-ALCA)

Keywords:YBCO thin films, Fluorine-free MOD, Br-addition

Among various methods of preparing REBCO thin films, fluorine-free MOD is one of the most promising method for mass production. Our group has been focusing on Cl-addition to the YBCO raw solution, which results in generation of oxychloride Ba₂Cu₃O₄Cl₂ (Ba2342). It was found that Ba2342 precipitates helped biaxial alignment of YBCO matrix and improved J_c properties. It is known in studies of sintered bulks that Br as well as Cl can be the candidate for the halogen sites in Ba2342 crystal structure. We will report the effects of Br-addition to the FF-MOD processed YBCO films in comparison to those of Cl-addition.