Abstract
Epitaxial NdBa2Cu3O7−δ (NdBCO) films with and without the incorporation of self-assembled nanodots ofBaZrO3 (BZO) were grown on rolling-assisted-biaxially-textured substrates(RABiTS) by pulsed laser deposition. Compared to epitaxialYBa2Cu3O7−δ (YBCO) films on RABiTS, NdBCO films are found to have superior performance inapplied fields at all field orientations, suggesting the presence of an increaseddensity of pinning centres. The incorporation of columns of self-assembled nanodotsof BZO within the NdBCO films results in further enhancement of the in-fieldJc at all fieldorientations. Jc variesas Jc∼H−α at intermediatefields, with α values for NdBCO and BZO-doped NdBCO films being∼0.37 and ∼0.43, respectively, which are significantly lower thanα∼0.52 for YBCO film.
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