Structural effects on the spin-state transition in epitaxially strainedfilms
- 11 February 2009
- journal article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 79 (5)
- https://doi.org/10.1103/physrevb.79.054409
Abstract
Using density functional theory within the LSDA + U method, we investigate the effect of strain on the spin state and magnetic ordering in perovskite lanthanum cobaltite, LaCoO3. We show that, while strain-induced changes in lattice parameters are insufficient to stabilize a non-zero spin state, additional heteroepitaxial symmetry constraints -- in particular the suppression of octahedral rotations -- stabilize a ferromagnetic intermediate-spin state. By comparing with experimental data for the bulk material, we calculate an upper bound on the Hubbard U value, and describe the role that the on-site Coulomb interaction plays in determining the spin-state configuration.Comment: RevTeX: 8 pages, 5 figures, expanded discussion and added FigureKeywords
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