Flux pinning properties in ErBa2Cu3Oy and YBa2Cu3Oy thin films with BaZrO3 nano-rods prepared by PLD were measured to investigate the flux pinning mechanism. The enhancement of Jc was confirmed by the measurement of the dependence of Jc on magnetic field. The angular dependence of Jc has a broad peak at B||c-axis. This result indicates that the BaZrO3 nano-rods work as the c-axis-correlated pinning centers. The pinning parameter m was evaluated from the electric fields versus current density characteristics and the peak of m appears in the magnetic field dependence. The characteristic behavior of m is caused by the matching of the density of BaZrO3 nano-rods with that of fluxoids. It is found that the relative distribution width of the local critical current density for the ErBa2Cu3Oy film with BaZrO3 nano-rods is smaller than that of the YBa2Cu3Oy films with BaZrO3 nano-rods.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering