A modified Landau-Devonshire thermodynamic potential for strontium titanate

被引：41

作者：

Sheng, G. ^{[1
]}

Li, Y. L. ^{[2
]}

Zhang, J. X. ^{[1
]}

Choudhury, S. ^{[1
]}

Jia, Q. X. ^{[3
]}

Gopalan, V. ^{[1
]}

Schlom, D. G. ^{[4
]}

Liu, Z. K. ^{[1
]}

Chen, L. Q. ^{[1
]}

机构：

[1] Penn State Univ, Dept Mat Sci & Engn, University Pk, PA 16802 USA

[2] Pacific NW Natl Lab, Richland, WA 99352 USA

[3] Los Alamos Natl Lab, Ctr Integrated Nanotechnol, Los Alamos, NM 87545 USA

[4] Cornell Univ, Dept Mat Sci & Engn, Ithaca, NY 14853 USA

来源：

APPLIED PHYSICS LETTERS | 2010年 / 96卷 / 23期

基金：

美国国家科学基金会;

关键词：

K PHASE-TRANSITION; SOFT PHONON MODES; INDUCED FERROELECTRICITY; THIN-FILMS; SRTIO3;

D O I：

10.1063/1.3442915

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The range of reported values of the Landau energy coefficients of bulk SrTiO3 leads to uncertainty in not only the magnitude but also the direction of the calculated spontaneous polarization in SrTiO3 thin films in a state of biaxial tension. In this study, we use experimental results from strained SrTiO3 films together with phase-field simulations to refine the values of the Landau energy coefficients and report a modified thermodynamic potential for bulk strontium titanate. The transition temperatures and ferroelectric/antiferrodistortive domain stabilities predicted from this modified potential agree well with measurements on biaxially strained SrTiO3 thin films. (C) 2010 American Institute of Physics. [doi:10.1063/1.3442915]

引用

页数：3

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