Structural evidence for enhanced polarization in a commensurate short-period BaTiO 3/SrTiO 3 superlattice

W. Tian, J. C. Jiang, X. Q. Pan, J. H. Haeni, Y. L. Li, L. Q. Chen, D. G. Schlom, J. B. Neaton, K. M. Rabe, Q. X. Jia

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Abstract

A short-period (BaTiO 3) 6/(SrTiO 3) 5 superlattice was characterized by x-ray diffraction and transmission electron microscopy. The superlattice is epitaxially oriented with the c axes of BaTiO 3 and SrTiO 3 normal to the (001) surface of the SrTiO 3 substrate. Despite the large in-plane lattice mismatch between BaTiO 3 and SrTiO 3 (∼2.2%), the superlattice interfaces were found to be nearly commensurate. The crystallographic c/a ratio of the superlattice was measured and the results agree quantitatively with first-principles calculations and phase-field modeling. The agreement supports the validity of the enhanced spontaneous polarization predicted for short-period BaTiO 3/SrTiO 3 superlattices.

Original languageEnglish (US)
Article number092905
JournalApplied Physics Letters
Volume89
Issue number9
DOIs
Publication statusPublished - Sep 8 2006

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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