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The flux pinning properties of the high temperature superconductor YBa 2 Cu 3 O 7− δ   (YBCO) have been conventionally improved by creating both columnar and dot-like pinning centres into the YBCO matrix. To study the effects of differently doped multilayer structures on pinning, several samples consisting of a multiple number of individually BaZrO 3  (BZO) and BaCeO 3  (BCO) doped YBCO layers were fabricated. In the YBCO matrix, BZO forms columnar and BCO dot-like defects. The multilayer structure improves pinning capability throughout the whole angular range, giving rise to a high critical current density,  J   c . However, the BZO doped monolayer reference still has the most isotropic  J   c . Even though BZO forms nanorods, in this work the samples with multiple thin layers do not exhibit a  c  axis peak in the angular dependence of  J   c . The angular dependencies and the approximately correct magnitude of  J   c  were also verified using a molecular dynamics simulation.

Enhanced flux pinning in YBCO multilayer films with BCO nanodots and segmented BZO nanorods