Abstract
Epitaxial La0.35Nd0.35Sr0.3MnO3(LNSMO) films and SrTiO3(STO)/LNSMO heterostructures have been grown on LaAlO3substrates by pulsed laser deposition. The effect of oxygen content on structure and properties of both the LNSMO and STO/LNSMO films was investigated through x-ray diffraction, atomic force microscopy, and resistivity-temperature measurements. It is found that the out-of-plane lattice constant and the metallic-semiconducting transition temperature of the LNSMO films are greatly influenced by the oxygen pressure during deposition, but, insensitive to the in situ annealing oxygen pressure ranging from 2 X 10-6to 10 Torr after the deposition. For the STO/ LNSMO heterostructures, oxygen out-diffusion from the LNSMO layer is evidenced when the top STO is deposited at an oxygen pressure of less than 5 X 10-4Torr and temperatures higher than 500°C. Our results strongly suggest that at the surface of as-grown LNSMO films a native passivation layer for oxygen diffusion may exist, and this layer could be damaged after depositing the STO film at reduced oxygen pressures.
| Original language | English |
|---|---|
| Pages (from-to) | 2378-2383 |
| Number of pages | 6 |
| Journal | Journal of Vacuum Science and Technology A: Vacuum, Surfaces and Films |
| Volume | 18 |
| Issue number | 5 |
| Publication status | Published - 1 Sept 2000 |
ASJC Scopus subject areas
- Surfaces, Coatings and Films
- Physics and Astronomy (miscellaneous)
- Surfaces and Interfaces
- Condensed Matter Physics