Microscopic analysis reveals spontaneous formation of perovskite nanorods in BaNb2O6-doped ErBa2Cu3O7−δ films, suggesting a novel mechanism for artificial pinning center creation.
Ba Nb 2 O 6 -doped microstructures as artificial pinning centers in ErBa2Cu3O7−δ films were studied by transmission electron microscopy. The presence of nanorods, which contain niobium, was confirmed from bright-field images and elemental map images. The crystal structure of the nanorod was determined to be cubic perovskite. The lattice constant of nanorods in the ErBa2Cu3O7−δ film was in good agreement with the lattice constant of Ba(Er0.5Nb0.5)O3. Furthermore, parallel Moiré fringes were observed in the bright-field images. It has never been confirmed by any other researchers that BaNb2O6 doped into the ErBa2Cu3O7−δ film transforms to Ba(Er0.5Nb0.5)O3 nanorods with a perovskite structure.
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Yamada et al. (2008) studied this question.
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