Abstract
Rare earth vanadate perovskites exhibit a phase diagram in which two different types of structural distortions coexist: the strongest, the rotation of the oxygen octahedra, comes from the small tolerance factor of the perovskite cell (t = 0.88 for LaVO3) and the smaller one comes from inter-site d-orbital interactions manifesting as a cooperative Jahn-Teller effect. Epitaxial strain acts on octahedral rotations and crystal field symmetry to alter this complex lattice-orbit coupling. In this study, LaVO3 thin film structures have been investigated by X-ray diffraction and scanning transmission electron microscopy. The analysis shows two different orientations of octahedral tilt patterns, as well as two distinct temperature behaviors, for compressive and tensile film strain states. Ab initio calculations capture the strain effect on the tilt pattern orientation in agreement with experimental data.
Highlights
Complex oxides with perovskite structures display a variety of physical properties, some being insulators, others superconductors, some showing ferroelectricity, and others ferromagnetic or charge orders.[1]
With chemical formula ABO3, the oxide perovskite unit cell adapts to the A and B cations by changing its crystal symmetry according√to the tolerance factor t, defined as the ratio between the cation-oxygen distances (t = [RA + RO]/[ 2(RB + RO)] with RA, RO, and RB being the A, O, and B ionic radii). t signals if the AO or the BO bonds are under tension or compression: for t equal to one, one observes a cubic symmetry
In the second part, using temperature dependent X-ray diffraction (XRD), we show that strain alters the natural bulk structural transition
Summary
Complex oxides with perovskite structures display a variety of physical properties, some being insulators, others superconductors, some showing ferroelectricity, and others ferromagnetic or charge orders.[1].
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