Interfacial Coherency and Ferroelectricity of BaTiO₃/SrTiO₃ Superlattice Films

Authors

Y. L. Li, Pennsylvania State University
S. Y. Hu, Pacific Northwest National Laboratory
Dmitri Tenne, Boise State UniversityFollow
A. Soukiassian, Pennsylvania State University
D. G. Schlom, Pennsylvania State University
X. X. Xi, Pennsylvania State University
K. J. Choi, University of Wisconisn

Document Type

Article

Publication Date

12-18-2007

Abstract

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.

Copyright Statement

This is an author-produced, peer-reviewed version of this article. The final, definitive version of this document can be found online at Applied Physics Letters, published by American Institute of Physics. Copyright restrictions may apply. DOI: 10.1063/1.2823608

Publication Information

Li, Y. L.; Hu, S. Y.; Tenne, Dmitri; Soukiassian, A.; Schlom, D. G.; Xi, X. X.; and Choi, K. J.. (2007). "Interfacial Coherency and Ferroelectricity of BaTiO₃/SrTiO₃ Superlattice Films". Applied Physics Letters, 91(25), 252904-1 - 252904-3. http://dx.doi.org/10.1063/1.2823608