Quick screening for new flux pinning materials in YBCO films with the combinatorial-PLD method

Abstract

An effective way to improve the superconducting properties in REBa2Cu3Oy (REBCO) films under a magnetic field is to dope artificial pinning centers (APC). The pinning performance depends on the content of the APC materials. Usually, the optimal APC content is explored by preparing films one at a time from the REBCO target using different APC material content, which is an extremely time-consuming process.The combinatorial-PLD (C-PLD) method allowed us to prepare films that continuously changed in composition across a single substrate. In this study, we used the C-PLD method to prepare BaSnO3 (BSO)-doped YBCO films. The films were deposited on SrTiO3 substrate using a fourth-harmonic Nd:YAG laser. From the results of the Jc–B curves at 77K and B//c, the film that contained 3.2vol.% of BSO exhibited the best pinning performance in this study. We showed that the C-PLD method was efficient for quick screening of the optimal APC content with only one deposition. We also used the C-PLD method to explore new APC materials, and proved that it can quickly evaluate the new APC materials Ba3Cu3In4O12 and BaTbO3.