Flux pinning in YBa_2Cu_3O_(7-δ) thin film samples linked to stacking fault density

摘要

In this paper, we report a strong correlation between the stacking fault (SF) density and the critical current density of YBa_2Cu_3O_(7-δ) (YBCO) thin films in applied field (J_c~(in-field)). We found that the J_c~(in-field)(H‖c) increases as a clear linear dependence of the density of SF identified in the as-grown samples deposited on both SrTiO_3 (STO) and LaAlO_3 substrates. Detailed microstructural studies including cross-section transmission electron microscopy (TEM) and high resolution TEM were conducted for all the films deposited on STO substrates. This work suggests that the YBCO SF density plays an important role in the YBCO in-field transport performance.