| Title |
|
|
|
Role of Nd/Ba substitution on the growth mode and on the structural properties of Nd-rich (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) |
|
|
| | |
|