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Title: Impact of symmetry on the ferroelectric properties of CaTiO{sub 3} thin films

Journal Article · · Applied Physics Letters
DOI:https://doi.org/10.1063/1.4918805· OSTI ID:22398932
;  [1]; ;  [2];  [3]; ;  [4];  [5]
  1. Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)
  2. Department of Materials Science and Engineering, Pennsylvania State University, University Park, Pennsylvania 16801 (United States)
  3. Stanford Synchrotron Lightsource SLAC National Accelerator Laboratory, Menlo Park, California 94025 (United States)
  4. Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)
  5. Department of Chemical Engineering and Materials Science, University of California Davis, Davis, California 95616 (United States)

Epitaxial strain is a powerful tool to induce functional properties such as ferroelectricity in thin films of materials that do not possess ferroelectricity in bulk form. In this work, a ferroelectric state was stabilized in thin films of the incipient ferroelectric, CaTiO{sub 3}, through the careful control of the biaxial strain state and TiO{sub 6} octahedral rotations. Detailed structural characterization was carried out by synchrotron x-ray diffraction and scanning transmission electron microscopy. CaTiO{sub 3} films grown on La{sub 0.18}Sr{sub 0.82}Al{sub 0.59}Ta{sub 0.41}O{sub 3} (LSAT) and NdGaO{sub 3} (NGO) substrates experienced a 1.1% biaxial strain state but differed in their octahedral tilt structures. A suppression of the out-of-plane rotations of the TiO{sub 6} octahedral in films grown on LSAT substrates resulted in a robust ferroelectric I4 mm phase with remnant polarization ∼5 μC/cm{sup 2} at 10 K and T{sub c} near 140 K. In contrast, films grown on NGO substrates with significant octahedral tilting showed reduced polarization and T{sub c}. These results highlight the key role played by symmetry in controlling the ferroelectric properties of perovskite oxide thin films.

OSTI ID:
22398932
Journal Information:
Applied Physics Letters, Vol. 106, Issue 16; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
Country of Publication:
United States
Language:
English

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Unleashing Strain Induced Ferroelectricity in Complex Oxide Thin Films via Precise Stoichiometry Control journal September 2016
A Hydrothermal Route to the Synthesis of CaTiO3 Nanocuboids Using P25 as the Titanium Source journal March 2018
Three-dimensional atomic scale electron density reconstruction of octahedral tilt epitaxy in functional perovskites journal December 2018
Large polarization and dielectric response in epitaxial SrZrO 3 films journal January 2016
Orbital configuration in CaTiO3 films on NdGaO3 journal October 2016
Effect of epitaxial strain and vacancies on the ferroelectric-like response of CaTiO 3 thin films journal October 2018
Emergent room temperature polar phase in CaTiO 3 nanoparticles and single crystals journal January 2019
Evolution of element-specific electronic structures in alkaline titanates journal June 2019
The under-pressure behaviour of mechanical, electronic and optical properties of calcium titanate and its ground state thermoelectric response journal April 2017
Precession electron diffraction tomography on twinned crystals: application to CaTiO 3 thin films journal May 2019
Enhanced Photocatalytic Performance and Mechanism of Au@CaTiO3 Composites with Au Nanoparticles Assembled on CaTiO3 Nanocuboids journal April 2019
Emergent room temperature polar phase in CaTiO3 nanoparticles and single crystals text January 2019