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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Stabilizing hidden room-temperature ferroelectricity via a metastable atomic distortion pattern.

Jeong Rae Kim1,2, Jinhyuk Jang3, Kyoung-June Go3

  • 1Center for Correlated Electron Systems, Institute for Basic Science (IBS), Seoul, 08826, Korea.

Nature Communications
|October 3, 2020
PubMed
Summary
This summary is machine-generated.

Researchers induced room-temperature ferroelectricity in nonpolar CaTiO3 by designing a novel, metastable oxygen octahedral rotation pattern. This discovery unlocks new possibilities for advanced perovskite oxide materials.

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Crystallography

Background:

  • Nonequilibrium atomic structures offer unique material properties.
  • Oxygen octahedral rotations are key distortions in perovskite oxides, but limited equilibrium patterns restrict functionality.
  • Nonequilibrium patterns are needed to expand perovskite oxide properties.

Purpose of the Study:

  • To engineer a metastable oxygen octahedral rotation pattern in CaTiO3.
  • To achieve room-temperature ferroelectricity in a material that is otherwise nonpolar.
  • To explore the link between specific octahedral rotation patterns and ferroelectric properties.

Main Methods:

  • Density-functional theory calculations guided the design and stabilization of the metastable pattern.
  • Heteroepitaxial film growth was used to create CaTiO3 films with the desired pattern.
  • Atomic-scale imaging and deep neural network analysis were employed for characterization.

Main Results:

  • A designed metastable oxygen octahedral rotation pattern was successfully stabilized in CaTiO3 films.
  • This metastable pattern induced robust room-temperature ferroelectricity in CaTiO3.
  • A strong correlation was confirmed between the metastable pattern and the observed ferroelectricity.

Conclusions:

  • A hidden, functional oxygen octahedral rotation pattern can be harnessed for material properties.
  • Metastable patterns offer a route to achieving desired functionalities in perovskite oxides.
  • This approach opens new avenues for designing multifunctional materials with tailored properties.