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Title
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Role of Nd/Ba substitution on the growth mode and on the structural properties of Nd-rich (Re=Nd, Y) thin films
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Author
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Abstract
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| Thin films of the superconducting Nd1+xBa2−xCu3O7−δ (NBCO) and Y1(NdxBa2−x)Cu3O7−δ (YNBCO) compounds have been deposited by dc magnetron sputtering and diode high pressure oxygen sputtering. Different techniques, including scanning tunneling microscopy, atomic force microscopy, X-ray diffraction and transmission electron microscopy (TEM) have been used to study the film microstructures and the surface morphology. It is shown that the Nd/Ba exchange promotes a 2D heteroepitaxial growth in the case of the NBCO films deposited on (1 0 0) SrTiO3 substrates, with a suppression of the characteristic 3D spirals structures. On the contrary in YNBCO the Nd/Ba exchange does not provide a driving force for the suppression of screw-dislocations, since spirals or towers originated by screw and half loop dislocations are observed on the surface. TEM reveals that anti-phase boundaries are eliminated during the growth of NBCO films thanks to the Nd/Ba exchange while this mechanism is not operating in the case of YNBCO films. |
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Language
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English
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Source (journal)
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Physica: C: superconductivity. - Amsterdam
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Publication
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Amsterdam
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2002
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ISSN
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0921-4534
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Volume/pages
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372-376
:2
(2002)
, p. 675-678
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ISI
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000178018800024
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Full text (Publisher's DOI)
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