Angular dependence of critical current density and n-values in BaZrO3/YBa2Cu3Oy quasi-multilayered films with columnar defects

作者：Sueyoshi T^*; Kotaki T; Fujiyoshi T; Mitsugi F; Ikegami T; Ishikawa N

来源：Physica C-Superconductivity and Its Applications, 2013, 494: 153-157.

DOI：10.1016/j.physc.2013.04.073

• Critical current density
• Columnar defects
• Nano-particles
• Hybrid flux pinning

BaZrO3/YBa2Cu3Oy quasi-multilayered films, in which the size and the spatial distribution of BaZrO3 nano-particles were controlled, were irradiated using 200 MeV Xe ions along the c-axis direction. When the BaZrO3 nano-particles were larger in size, the flux lines not captured by CDs, such as interstitial flux lines between CDs and double kinks of flux lines, can be pinned more effectively by the BaZrO3 nano-particles, so that the J(c) enhances for high magnetic fields and high temperature. In addition, the inverse correlation between J(c) and n-value appears at high temperature in increasing magnetic field for the film with correlated rows of the nano-particles which might be curved off the c-axis. These suggest that the hybrid flux pinning depends not only on the combination of one-dimensional (1D) and three-dimensional pinning centers (3D-PCs) but also on the size and the spatial distribution of the 3D-PCs.

• 出版日期2013-11