A new technique to achieve thick Tl2Ba2CaCu2O8 films for advanced applications. Issue 10 (15th May 2023)

• Record Type: Journal Article
• Authors: Liang, Xuelian; Niu, Zihan; Li, Tianci; Chen, Jihuang; Zhao, Haiting; Yang, Qian; He, Ming; Feng, Min; Zeng, Cheng; Ji, Lu
• Is Part Of: Ceramics international. Volume 49:Issue 10(2023)
• Page Start: 15665
• Page End: 15672
• Publication Date: 2023-05-15
• Subjects: Tl-2212 films -- Interface layer -- Critical current density (Jc) -- Microwave surface resistance (Rs); Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2023.01.158
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Tl2 Ba2 CaCu2 O8 (Tl-2212) high-temperature superconductors (HTS) exhibit excellent superconductivity performance as their critical temperature ( T c ) is higher than 100 K. However, the emergence of microcracks on the film surface restricts the thickness of the obtained Tl-2212 films, thus greatly limiting their scientific research and engineering application. Here, we fabricate crack-free Tl2 Ba2 CaCu2 O8 (Tl-2212) films with a thickness of up to 5 μm on LaAlO3 (001) substrates synthesized by an improved strategy of a closed system. The impact of the thickness of the Tl-2212 films on their crystallographic orientations, T c, critical current density ( J c ) (0 T), critical current intensity ( I c ) (0 T), and microwave surface resistance ( R s ) was systemically explored. As the thickness increases, T c values fluctuate slightly above 100 K while the variation of J c follows the extended strong pinning theory. I c of the 4 μm thick film stays around 80 A at 95 K, and the R s result is less than 1 mΩ at 93 K, indicating their excellent performance at high temperatures. The interaction mechanism between the J c and R s of the Tl-2212 film is replenished in light of the quantitative exploration of J c and R s. This work on Tl-2212 films will promote their fundamental physics research and guide their potential applications in the electronics and electrical field. It can also serve as a reference for future research on other HTS materials.