Phase transitions and polarizations in epitaxial BaTiO3/SrTiO3 superlattices studied by second-harmonic generation

被引:101
作者
Jiang, AQ
Scott, JF
Lu, HB
Chen, ZH
机构
[1] Univ Cambridge, Dept Earth Sci, Cambridge CB2 3EQ, England
[2] Chinese Acad Sci, Inst Phys, Lab Opt Phys, Beijing 100086, Peoples R China
关键词
D O I
10.1063/1.1533094
中图分类号
O59 [应用物理学];
学科分类号
摘要
BaTiO3/SrTiO3 superlattices are found to have a critical periodicity of 30 SrTiO3 unit cells, below which the room-temperature symmetry is mm2 orthorhombic. The orthorhombic-tetragonal phase-transition temperature is shifted upward from the bulk value (<3 K and normally not observed at finite temperature) of the quantum paraelectric pure strontium titanate to temperatures above ambient (599 K for 30/30-unit-cell superlattices). Antidipole patterns appear in superlattices with unit cells below 10/10. A model is presented that accounts quantitatively for the change in second-harmonic generation intensity with superlattice periodicity from 4 unit cells to 50. (C) 2003 American Institute of Physics.
引用
收藏
页码:1180 / 1185
页数:6
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