High-Jc YBa2Cu3O7-x (YBCO) films on SrTiO3 substrates are successfully obtained by post-annealing of precursors films which are deposited by a co-evaporation technique with Y, BaF2 and Cu evaporation sources at room temperature. In the case of using fluoride as the starting material for YBCO fabrications, water vapour is commonly introduced to decompose the fluoride in an annealing process. However, in the present process, we intentionally did not introduce water vapour. The obtained YBCO films have a high Jc of over 1 MA cm-2 at 77 K and a self-field. This work has demonstrated that the additional water vapour is not required to obtain a high-Jc YBCO film regardless of whether fluoride is used as a starting material or not.
All Science Journal Classification (ASJC) codes
- Ceramics and Composites
- Condensed Matter Physics
- Metals and Alloys
- Electrical and Electronic Engineering
- Materials Chemistry