Effect of BaZrO_3/Ag hybrid doping to the microstructure and performance of fluorine-free MOD method derived YBa_2Cu_3O_(7-x) superconducting thin films

摘要

It is known that BaZrO_3 and Ag can improve the magnetic and transport performance of YBCO thin film through totally disparate ways. BaZrO_3 plays the role of flux pinning centers and Ag improves the transparency of the YBCO grain boundaries. However, similar research is rare on the fluorine-free derived YBCO films. In this research, BaZrO_3-doped, Ag-doped and BaZrO_3/Ag hybrid-doped YBCO films were synthesized through a fluorine-free metal-organic deposition method. BaZrO_3 was found to deteriorate the microstructure and performance of YBCO, while Ag-doping was found to enhance the crystallization of YBCO and resulted in a high Jc of 3.87 MA/cm~2 in self-field at 77 K. However, the micro-structure and performance of the BaZrO_3/Ag hybrid-doped YBCO film showed that the positive impact of Ag-doping was totally overwhelmed by that of BaZrO_3.