Superlattice-induced ferroelectricity in charge-ordered La 1/3 Sr 2/3 FeO 3
Abstract
Charge-order–driven ferroelectrics are an emerging class of materials with promise for high-frequency electron-dominated polarization switching, distinct from conventional ferroelectrics. However, only a few systems exhibiting this behavior have been experimentally realized thus far. With continued development of layer-by-layer growth techniques with a high level of composition control, the exploration of charge-ordered ferroelectrics can be extended to artificially structured superlattices. Here, we use density-functional theory to explore an experimentally realized bulk perovskite iron-oxide solid solution with robust charge ordering and find that in superlattices formed by layered cation ordering, bulk charge ordering is maintained and can lead to charge-order–driven ferroelectricity. Our results suggest that other broad classes of mixed valence materials may be promising candidates for discovery of electronic ferroelectrics.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Nov 11, 2019
- Source ID
- 10.1073/pnas.1906513116
Entities
People
- Jeffrey B. Neaton
- Karin M. Rabe
- Se Young Park
Organizations
- Institute for Basic Science
- Lawrence Berkeley National Laboratory
- Office of Naval Research
- Rutgers University
- Seoul National University
- United States Department of Energy