Structural evidence for enhanced polarization in a commensurate short-period BaTiO3/SrTiO3 superlattice

被引：83
|
作者：
Tian, W. [1 ]
Jiang, J. C.
Pan, X. Q.
Haeni, J. H.
Li, Y. L.
Chen, L. Q.
Schlom, D. G.
Neaton, J. B.
Rabe, K. M.
Jia, Q. X.
机构：
[1] Univ Michigan, Dept Mat Sci & Engn, Ann Arbor, MI 48109 USA
[2] Penn State Univ, Dept Mat Sci & Engn, University Pk, PA 16802 USA
[3] Rutgers State Univ, Dept Phys & Astron, Piscataway, NJ 08854 USA
[4] Los Alamos Natl Lab, MPA, STC, Los Alamos, NM 87545 USA
来源：
APPLIED PHYSICS LETTERS | 2006年 / 89卷 / 09期
基金：
美国国家科学基金会;
关键词：
D O I：
10.1063/1.2335367
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
A short-period (BaTiO3)(6)/(SrTiO3)(5) superlattice was characterized by x-ray diffraction and transmission electron microscopy. The superlattice is epitaxially oriented with the c axes of BaTiO3 and SrTiO3 normal to the (001) surface of the SrTiO3 substrate. Despite the large in-plane lattice mismatch between BaTiO3 and SrTiO3 (similar to 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 BaTiO3/SrTiO3 superlattices. (c) 2006 American Institute of Physics.
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页数：3
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