Publication
Title
Role of Nd/Ba substitution on the growth mode and on the structural properties of Nd-rich $Re_{1}(Nd_{x}Ba_{2-x})Cu_{3}O_{7-\delta}$ (Re=Nd, Y) thin films
Author
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.
Language
English
Source (journal)
Physica: C: superconductivity. - Amsterdam
Publication
Amsterdam : 2002
ISSN
0921-4534
Volume/pages
372-376:2(2002), p. 675-678
ISI
000178018800024
Full text (Publisher's DOI)
UAntwerpen
 Faculty/Department Research group Publication type Subject Affiliation Publications with a UAntwerp address