Effect of Strain on the Local Perovskite Structure: La0.5Sr0.5CoO3
- Resource Type
- Journal Article
- Authors
- Source
- Journal of Applied Physics; 109; 8
- Subject
- 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS BOND ANGLE
BOND LENGTHS
DEPOSITION
FINE STRUCTURE
LASERS
MAGNETIC PROPERTIES
PEROVSKITE
RELAXATION
STRAINS
SUBSTRATES
THIN FILMS
- Language
- English
- ISSN
- 0021-8979
Extended x-ray-absorption fine structure has been used to study the bond-length and bond-angle distortions in thin ({approx}220 {angstrom}) La{sub 0.5}Sr{sub 0.5}CoO{sub 3} films grown epitaxially on SrTiO{sub 3} and LaAlO{sub 3} substrates. Growth on these substrates produces films with both in-plane tensile and in-plane compressive strains, respectively. It is found that the strain imposed on the thin-film lattice is accommodated mostly through changes in the first-shell Co-O bond lengths and third-shell Co-Co distances, while second-shell Co-La and Co-Sr distances behave similarly to distortions found previously in the tetrahedral semiconductors; i.e., they are most strongly affected by bond-angle distortions that account for the relaxation of the film lattice constant perpendicular to the film/substrate interface. These structural changes are directly correlated with the magnetic properties of the films.