Orthorhombic strontium titanate in BaTiO3-SrTiO3 superlattices

被引：72

作者：

Ríos, S. ^{[1
]}

Ruediger, A. ^{[1
]}

Jiang, A.Q. ^{[1
]}

Scott, J.F. ^{[1
]}

Lu, H. ^{[2
]}

Chen, Z. ^{[2
]}

机构：

[1] Symetrix Centre for Ferroics, Department of Earth Sciences, University of Cambridge

[2] Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences

来源：

Journal of Physics Condensed Matter | 2003年 / 15卷 / 21期

关键词：

Barium titanate - Ferroelectric materials - Free energy - Strain - Strontium compounds - X ray analysis;

D O I：

10.1088/0953-8984/15/21/101

中图分类号：

学科分类号：

摘要：

It has been suggested by several authors that SrTiO3 layers in SrTiO3-BaTiO3 superlattices should be tetragonal and ferroelectric at ambient temperatures, like the BaTiO3 layers, rather than cubic, as in bulk SrTiO3, and that free-energy minimization requires continuity of the polarization direction. A recent ab initio calculation constrained solutions to this structure. Surprisingly, our x-ray study shows that the SrTiO3 layers are orthorhombic with 0.03% in-plane strain, with the BaTiO3 c-axis matching the SrTiO3 a- and b-axis better than the c-axis; strain energy overcomes the cost in electrostatic energy.

引用

页码：L305 / L309

页数：4

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