Strain and orientation engineering in ABO₃perovskite oxide thin films

Area of Science:

• Materials Science
• Condensed Matter Physics
• Solid State Chemistry

Background:

• Perovskite oxides (ABO3) exhibit diverse properties like ferroelectricity, magnetism, and superconductivity.
• Epitaxial thin films allow exploration of novel phenomena, with substrates inducing unique phases and properties.
• Substrate-imposed conditions (strain, orientation, symmetry) significantly influence perovskite film functionality.

Purpose of the Study:

• To review the state-of-the-art in epitaxial strain and orientation engineering of perovskite oxide thin films.
• To elucidate how substrate-induced effects, including strain and crystallographic orientation, modify film properties.
• To highlight the role of oxygen octahedra connectivity in film-substrate interactions.

Main Methods:

• Review of existing literature on epitaxial strain and orientation engineering in perovskite thin films.
• Analysis of substrate-induced mechanical boundary conditions (strain, orientation, symmetry).
• Case studies of ferroelectric, magnetic, and nonlinear optical perovskite oxides.

Main Results:

• Uniform biaxial strain and substrate crystallographic orientation can induce symmetry changes in perovskite films.
• Substrate engineering can stabilize phases not observed in bulk perovskite materials.
• Oxygen octahedra connectivity is influenced by strain and crystallographic orientation, impacting film properties.

Conclusions:

• Epitaxial engineering offers powerful control over perovskite thin film properties.
• Further research is needed on the interplay between strain, orientation, and functional properties.
• Future directions include exploring novel phases and optimizing material design for specific applications.