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Title: Atomic scale imaging of competing polar states in a Ruddlesden–Popper layered oxide

Journal Article · · Nature Communications
DOI:https://doi.org/10.1038/ncomms12572· OSTI ID:1377432
 [1];  [2];  [3];  [2];  [4];  [5]; ORCiD logo [6];  [7];  [1];  [1]
  1. Pennsylvania State Univ., University Park, PA (United States). Dept. of Material Sciences and Engineering
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Molecular Foundry
  3. Univ. of Minnesota, Minneapolis, MN (United States)
  4. 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
  5. Pennsylvania State Univ., University Park, PA (United States)
  6. Cornell Univ., Ithaca, NY (United States)
  7. 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
Citation Metrics:
Cited by: 27 works
Citation information provided by
Web of Science

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A streaming multi-GPU implementation of image simulation algorithms for scanning transmission electron microscopy journal October 2017
mpfit: a robust method for fitting atomic resolution images with multiple Gaussian peaks journal January 2020
A Streaming Multi-GPU Implementation of Image Simulation Algorithms for Scanning Transmission Electron Microscopy preprint January 2017