The vortex path model and angular dependence ofJc in thin YBCO films deposited from undoped andBaZrO3-doped targets

Abstract

The vortex path model is applied toJc(θ) dataof YBa2Cu3O6+x (YBCO) thin films with different densities and types of columnar defects. Thefilms were prepared by laser deposition from micro- and nanograined undoped andBaZrO3-doped nanograined targets. It is found that in theab-axis direction the model gives parameters which can be interpretedin terms of vortices trapped in the Cu–O spacer layers. In thec direction the model gives estimates of average vortex path shapes and explains the shoulders close to theab peak frequentlyobserved in the Jc(θ) data without the need for assuming changes in the electronic mass anisotropy.