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Elsevier, Physica C: Superconductivity and its Applications, (372-376), p. 675-678

DOI: 10.1016/s0921-4534(02)00828-6

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Role of Nd/Ba substitution on the growth mode and on the structural properties of Nd-rich Re_{1}(Nd_{x}Ba_{2-x})Cu_{3}O_{7-δ} (Re=Nd, Y) thin films

Journal article published in 2002 by M. Salluzzo, C. Aruta ORCID, G. Ausanio, Sara Bals, d' A Agostino, A. D'Agostino, M. G. Maglione
This paper was not found in any repository, but could be made available legally by the author.
This paper was not found in any repository, but could be made available legally by the author.

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Abstract

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.