Modeling reduced field dependence of critical current density in YBa2Cu3O6+x films with nanorods

: Palonen H, Jäykka J, Paturi P

Publisher: AMER PHYSICAL SOC

: 2012

: Physical Review B

: PHYSICAL REVIEW B

: PHYS REV B

: 2

: 85

: 2

: 1

: 7

: 1098-0121

DOI: https://doi.org/10.1103/PhysRevB.85.024510

Flux pinning is still the main limiting factor for the critical current of the high-temperature superconductors in high fields. In this paper, we model the field dependence of the critical current in thin films with columnar defects aligned with the field. The characteristic shape of the critical current of the BaZrO3-doped YBa2Cu3O6+x thin films is reproduced and explained. The model is based on solving the Ginzburg-Landau equations with columnar defects present in the lattice. The size of the columnar defect is found to be of key importance in explaining the rounded shape of the critical current of the BaZrO3-doped YBa2Cu3O6+x thin films. It is also found that the size of the rod changes the long-range order of the vortex lattice.

Physical sciences