Correlated pinning behavior in ErBa(2)Cu(3)O(y)@ films with BaZrO(3) nano-rods

• Published in: Physica. C, Superconductivity Superconductivity, 2009-10, Vol.469 (15-20), p.1404-1409
• Main Authors: Namba, M, Awaji, S, Watanabe, K, Ito, S, Aoyagi, E, Kai, H, Mukaida, M, Kita, R
• Format: Article
• Language: English
• ISSN: 0921-4534
• DOI: 10.1016/j.physc.2009.05.046

In REBa(2)Cu(3)O(y)) (RE123) films with BaZrO(3@ (BZO), the columnar shaped BZO precipitates, called nano-rods, are formed as the c-axis-correlated pinning centers. In order to understand the vortex pinning properties of RE123 films with BZO nano-rods, we measured the resistivity [rho] and critical current density J(c) of three different films, i.e. the Er123 films with 0, 1.5 and 3.5 wt% BZO prepared by pulsed laser deposition. We found that the peak related to the c-axis-correlated pinning in the angular dependence of J(c) became large in a low field region but small in a high magnetic field with increasing BZO concentration. In addition, the irreversibility field at Bc-axis increased also with increasing BZO concentration, although the dip in the angular dependence of [rho] and the peak of the J(c) at Bc-axis decreased in the high magnetic field near the irreversible field. It is suggested that the BZO addition is effective to the enhancement of J(c) in a low field region as well as the improvement of the irreversibility field. However, we have to consider the c-axis-correlated pinning by the edge dislocations as well as the nano-rods in order to understand it in a high field region.