We introduced high-density extended crystalline defects, which result in artificial pinning centers of the quantized vortices, into c-axis oriented YBa2Cu3O7-x (YBCO) films. The crystalline defects created perpendicular to the film surface were derived, during the film deposition process, by the distributed nano-sized Y2O3 islands prepared on SrTiO3 (100) substrates. The Y2O 3 nano-islands were approximately 3 nm in height and 25 nm in diameter and the density was controlled from about 89 to 212 μm-2 by choosing the Y2O3 deposition condition. Jcs of YBCO films grown on SrTiO3 substrates with the extended defects were increased by about 150% higher than those of YBCO films without the defects.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering