Year: 2024
Type: article
Abstract: The collective rotations of oxygen octahedra play an important role in determining the physical properties of functional perovskite oxides. The epitaxial strain can serve as an effective means to modify the oxygen octahedral symmetry (OOS), i.e., oxygen octahedral rotation or tilt (OOR/OOT). However, the strain‐OOS coupling that may alter the details of the OOS, thereby the physical properties, has not been fully understood. In this work, it is demonstrated that epitaxial strain can not only induce a structural phase transition but also precisely tune the degree of OOR. The correlated metal CaNbO3, which is orthorhombic, is studied by growing as epitaxial thin films. By imposing epitaxial strain, it is found that the film undergoes a structural phase transition from orthorhombic to tetragonal upon fully straining (i.e., from a+b−b− to a0a0c−). In unstrained films, the octahedral rotation along the c‐axis is as large as 15.7° that can be tuned to 6.6° by strain. This finding offers a general approach to manipulating OOR/OOT via strain engineering in complex oxide heterostructures.
Source: Advanced Materials Interfaces
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $3,100
Funders: U.S. Department of Energy, Advanced Photon Sciences, National Energy Research Scientific Computing Center, National Research Foundation, National Research Foundation of Korea, Ministry of Science and ICT, South Korea, Office of Science, Basic Energy Sciences, Argonne National Laboratory, Oak Ridge National Laboratory
Awards: G1019100964, G102163711, G107546177, G121915436, G122673668, G1286236842, G1286251239, G1313983767, G1645119126, G1664757510, G1677143136, G203625172, G2287611682, G2295483553, G262962599, G2638771445, G2988778103, G30714459, G3075337988, G3083819904, G419881185, G426311843, G42916606, G4423657506, G4501827968, G498139845, G5076365615, G5129940632, G5154659297, G5387317844, G5685490445, G650090426, G660579501, G675320460, G6848031779, G6918803902, G7583137537, G7651947074, G807938293, G8269158468, G8286507625, G8906985441, G969889393, G993149817
OpenAlex ID: W4404104159