We studied the phase transitions, domain morphologies, and polarizations in BaTiO3/SrTiO3 superlattices grown on SrTiO3 substrates. Using the phase field approach, we discovered the remarkable influence of film/substrate interfacial coherency on the ferroelectricity of the SrTiO3 layers within a superlattice: it is an orthorhombic ferroelectric for an incoherent interface while it exhibits only induced polarization by the adjacent BaTiO3 layers for a coherent interface. We presented the domain morphologies within individual BaTiO3 and SrTiO3 layers which have different ferroelectric symmetries. The results are compared to ultraviolet Raman spectroscopy and variable temperature x-ray diffraction measurements.
Revised: August 27, 2009 |
Published: December 20, 2007
Citation
Li Y., S.Y. Hu, D. Tenne, A. Soukiassian, D. Schlom, L. Chen, and X. Xi, et al. 2007.Interfacial coherency and ferroelectricity of BaTiO3/SrTiO3 superlattice films.Applied Physics Letters 91, no. 25:252904.PNNL-SA-59256.doi:10.1063/1.2823608