Atomic scale imaging of competing polar states in a Ruddlesden–Popper layered oxide
- Pennsylvania State Univ., University Park, PA (United States). Dept. of Material Sciences and Engineering
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Molecular Foundry
- Univ. of Minnesota, Minneapolis, MN (United States)
- Pennsylvania State Univ., University Park, PA (United States). Dept. of Material Sciences and Engineering; Cornell Univ., Ithaca, NY (United States). Dept. of Materials Science and Engineering
- Pennsylvania State Univ., University Park, PA (United States)
- Cornell Univ., Ithaca, NY (United States)
- Cornell Univ., Ithaca, NY (United States). Dept. of Materials Science and Engineering
Layered complex oxides offer an unusually rich materials platform for emergent phenomena through many built-in design knobs such as varied topologies, chemical ordering schemes and geometric tuning of the structure. A multitude of polar phases are predicted to compete in Ruddlesden-Popper (RP), A n+1 B n O 3n+1 , thin films by tuning layer dimension (n) and strain; however, direct atomic-scale evidence for such competing states is currently absent. Using aberration-corrected scanning transmission electron microscopy with sub-Ångstrom resolution in Sr n+1 Ti n O 3n+1 thin films, we demonstrate the coexistence of antiferroelectric, ferroelectric and new ordered and low-symmetry phases. We also directly image the atomic rumpling of the rock salt layer, a critical feature in RP structures that is responsible for the competing phases; exceptional quantitative agreement between electron microscopy and density functional theory is demonstrated. The study shows that layered topologies can enable multifunctionality through highly competitive phases exhibiting diverse phenomena in a single structure.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- AC02-05CH11231; DMR-1420620; DMR-1210588; DMR-1056441
- OSTI ID:
- 1377432
- Journal Information:
- Nature Communications, Vol. 7; ISSN 2041-1723
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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