Abstract
Abstract We have studied the effects of partial substitution of rare-earth (RE) ions for yttrium in YBa2Cu3O7 films prepared by fluorine-free metal organic deposition. The substitution was conducted through Y/RE multi-layer precursor films. We found that critical current density ( J c) in self field strongly depends on RE elements and increased by up to 44% with respect to an unsubstituted sample. Structural characteristics of the films were investigated using x-ray diffraction and transmission/scanning electron microscope, and we found several characteristic RE-dependences indicative of their close relation to the J c enhancement.
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