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Open Access Publications from the University of California

Impact of symmetry on the ferroelectric properties of CaTiO3thin films

  • Author(s): Biegalski, MD
  • Qiao, L
  • Gu, Y
  • Mehta, A
  • He, Q
  • Takamura, Y
  • Borisevich, A
  • Chen, LQ
  • et al.

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© 2015 AIP Publishing LLC. 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, CaTiO3, through the careful control of the biaxial strain state and TiO6octahedral rotations. Detailed structural characterization was carried out by synchrotron x-ray diffraction and scanning transmission electron microscopy. CaTiO3films grown 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 TiO6octahedral in films grown on LSAT substrates resulted in a robust ferroelectric I4?mm phase with remnant polarization ∼5?μC/cm2at 10?K and Tcnear 140?K. In contrast, films grown on NGO substrates with significant octahedral tilting showed reduced polarization and Tc. These results highlight the key role played by symmetry in controlling the ferroelectric properties of perovskite oxide thin films.

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