Impact of symmetry on the ferroelectric properties of CaTiO3 thin films
Abstract
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 paper, a ferroelectric state was stabilized in thin films of the incipient ferroelectric, CaTiO3, through the careful control of the biaxial strain state and TiO6 octahedral rotations. Detailed structural characterization was carried out by synchrotron x-ray diffraction and scanning transmission electron microscopy. CaTiO3filmsgrown on La0.18Sr0.82Al0.59Ta0.41O3 (LSAT) and NdGaO3 (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 TiO6 octahedral in filmsgrown on LSAT substrates resulted in a robust ferroelectricI4 mm phase with remnant polarization ~5 μC/cm2 at 10 K and Tc near 140 K. In contrast, filmsgrown on NGO substrates with significant octahedral tilting showed reduced polarization and Tc. Finally, these results highlight the key role played by symmetry in controlling the ferroelectric properties of perovskite oxide thin films.
- Authors:
-
[2];
[5];
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences
- Pennsylvania State Univ., University Park, PA (United States). Dept. of Materials Science and Engineering
- SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Synchrotron Lightsource
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
- Univ. of California, Davis, CA (United States). Dept. of Chemical Engineering and Materials Science
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
- OSTI Identifier:
- 1265588
- Alternate Identifier(s):
- OSTI ID: 1226737
- Grant/Contract Number:
- AC05-00OR22725; AC02-76SF00515; DMR 0747896; DMR 1410701; DMR 1420620
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Applied Physics Letters
- Additional Journal Information:
- Journal Volume: 106; Journal Issue: 16; Journal ID: ISSN 0003-6951
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Biegalski, Michael D., Qiao, Liang, Gu, Yijia, Mehta, Apurva, He, Qian, Takamura, Yayoi, Borisevich, Albina Y., and Chen, Long-Qing. Impact of symmetry on the ferroelectric properties of CaTiO3 thin films. United States: N. p., 2015.
Web. doi:10.1063/1.4918805.
Biegalski, Michael D., Qiao, Liang, Gu, Yijia, Mehta, Apurva, He, Qian, Takamura, Yayoi, Borisevich, Albina Y., & Chen, Long-Qing. Impact of symmetry on the ferroelectric properties of CaTiO3 thin films. United States. https://doi.org/10.1063/1.4918805
Biegalski, Michael D., Qiao, Liang, Gu, Yijia, Mehta, Apurva, He, Qian, Takamura, Yayoi, Borisevich, Albina Y., and Chen, Long-Qing. Wed .
"Impact of symmetry on the ferroelectric properties of CaTiO3 thin films". United States. https://doi.org/10.1063/1.4918805. https://www.osti.gov/servlets/purl/1265588.
@article{osti_1265588,
title = {Impact of symmetry on the ferroelectric properties of CaTiO3 thin films},
author = {Biegalski, Michael D. and Qiao, Liang and Gu, Yijia and Mehta, Apurva and He, Qian and Takamura, Yayoi and Borisevich, Albina Y. and Chen, Long-Qing},
abstractNote = {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 paper, a ferroelectric state was stabilized in thin films of the incipient ferroelectric, CaTiO3, through the careful control of the biaxial strain state and TiO6 octahedral rotations. Detailed structural characterization was carried out by synchrotron x-ray diffraction and scanning transmission electron microscopy. CaTiO3filmsgrown on La0.18Sr0.82Al0.59Ta0.41O3 (LSAT) and NdGaO3 (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 TiO6 octahedral in filmsgrown on LSAT substrates resulted in a robust ferroelectricI4 mm phase with remnant polarization ~5 μC/cm2 at 10 K and Tc near 140 K. In contrast, filmsgrown on NGO substrates with significant octahedral tilting showed reduced polarization and Tc. Finally, these results highlight the key role played by symmetry in controlling the ferroelectric properties of perovskite oxide thin films.},
doi = {10.1063/1.4918805},
journal = {Applied Physics Letters},
number = 16,
volume = 106,
place = {United States},
year = {Wed Apr 22 00:00:00 EDT 2015},
month = {Wed Apr 22 00:00:00 EDT 2015}
}
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Works referencing / citing this record:
Unleashing Strain Induced Ferroelectricity in Complex Oxide Thin Films via Precise Stoichiometry Control
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