2014 年 49 巻 3 号 p. 131-138
The Combinatorial-PLD (C-PLD) method is an efficient way to screen the optimal composition in YBCO thin films because it is possible to create a film with a continuously changing composition across a single substrate. In this paper, we report on the quick exploration of optimal content for flux pinning materials in YBCO thin films using the C-PLD method. We optimized the content of BaSnO3 and the optimal content was almost the same as that of another report. Candidates for new pinning materials were also explored using the C-PLD method. Furthermore, we substituted a part of the Cu in YBCO films with various types of 3d-metals. As a result, upper critical fields (Hc2) were improved by substituting Co and Ni. Though Hc2 in a pure-YBCO film was about 100 T at 0 K, the YBCO films with the substitution of Co and Ni achieved an Hc2 of about 270 T at 0 K.