Abstract
The flux pinning properties of the high temperature superconductor YBa2Cu3O7−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 BaZrO3 (BZO) and BaCeO3 (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, Jc. However, the BZO doped monolayer reference still has the most isotropic Jc. 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 Jc. The angular dependencies and the approximately correct magnitude of Jc were also verified using a molecular dynamics simulation.
Highlights
To tune the high-temperature superconductor YBa2Cu3O7−δ (YBCO) towards higher critical current, Jc, and smaller anisotropy, it has been found useful to create defects of various sizes and shapes into the YBCO matrix
molecular dynamics (MD) models that can reproduce the angular dependence of Jc, have not been published
Films with alternating layers of BZO and BCO doped layers were fabricated with pulsed laser deposition
Summary
To tune the high-temperature superconductor YBa2Cu3O7−δ (YBCO) towards higher critical current, Jc, and smaller anisotropy, it has been found useful to create defects of various sizes and shapes into the YBCO matrix. YBCO is doped with a non-superconducting dopant, like BaZrO31,2 (BZO) or BaSnO33,4 (BSO). More recently Ba2YNbO65 has been used and doping can be fine-tuned by using Ba2YTaO66 All these dopants create nanosized rods when deposited using pulsed laser deposition (PLD). In PLD made films, non-correlated, nanosized dot-like defects are rarely used alone, but combined with nanorods for enhanced pinning. By tuning the length of the segmented nanorods, the behaviour of Jc in different magnetic fields and orientations can be greatly modified. Because of their structure, the segmented nanorods can act as more diverse pinning centres than rods penetrating through the whole sample. MD models that can reproduce the angular dependence of Jc, have not been published
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