Critical-current (JJ measurements for YBaO,.. (YBCO), Gd0.6Ca04Ba16La,4Cu,O,., (TXGBCO) and TX-GBCO/YBCO bilayers were performed with transport measurements at different applied magnetic fields. The film samples were prepared by pulsed laser deposition and patterned as microbridges. The highest J, (1.5 x 10' A/cm2) at 75 K in 5 Tesla (Hllab) was observed for TX-GBCO/YBCO bilayers, which showed a 40 % increase in Jc over YBCO under the same conditions. The biiayer samples possess a Tc at 90 K and display superconducting properties similar to YBCO. A possible mechanisms for the high Jc of biiayer YBCO films is discussed. Development of these biiayer and multilayer structures represents a promising new direction to improve the superconducting properties of YBCO since the TX-GBCO layer provide both protection against corrosion and a significant improvement in Je.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering