Ultra-low coercive field of improper ferroelectric Ca3Ti2O7epitaxial thin films

X. Li, L. Yang, C. F. Li, M. F. Liu, Z. Fan, Y. L. Xie, C. L. Lu, L. Lin, Z. B. Yan, Z. Zhang, Jiyan Dai, J. M. Liu, S. W. Cheong

Research output: Journal article publicationJournal articleAcademic researchpeer-review

24 Citations (Scopus)


� 2017 Author(s). Hybrid improper ferroelectrics have their electric polarization generated by two or more combined non-ferroelectric structural distortions, such as the rotation and tilting of Ti-O octahedral in the Ca3Ti2O7(CTO) family. In this work, we prepare the high quality (010)-oriented CTO thin films on (110) SrTiO3(STO) substrates by pulsed laser deposition. The good epitaxial growth of the CTO thin films on the substrates with the interfacial epitaxial relationship of [001]CTO//[001]STO and [100]CTO//[-110]STO is revealed. The in-plane ferroelectric hysteresis unveils an ultralow coercive field of ∼5 kV/cm even at low temperature, nearly two orders of magnitude lower than that of bulk CTO single crystals. The huge difference between the epitaxial thin films and bulk crystals is most likely due to the lattice imperfections in the thin films rather than substrate induced lattice strains, suggesting high sensitivity of the ferroelectric properties to lattice defects.
Original languageEnglish
Article number042901
JournalApplied Physics Letters
Issue number4
Publication statusPublished - 23 Jan 2017

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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