Title
Role of Nd/Ba substitution on the growth mode and on the structural properties of Nd-rich <tex>$Re_{1}(Nd_{x}Ba_{2-x})Cu_{3}O_{7-\delta}$</tex> (Re=Nd, Y) thin films Role of Nd/Ba substitution on the growth mode and on the structural properties of Nd-rich <tex>$Re_{1}(Nd_{x}Ba_{2-x})Cu_{3}O_{7-\delta}$</tex> (Re=Nd, Y) thin films
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Amsterdam ,
Subject
Physics
Source (journal)
Physica: C: superconductivity. - Amsterdam
Volume/pages
372-376(2002) :2 , p. 675-678
ISSN
0921-4534
ISI
000178018800024
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
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.
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