Zn doping-induced enhanced dielectric response of quantum paraelectric SrTiO3

被引：6

作者：

Guo, Y. Y. ^{[1
]}

Guo, Y. J. ^{[1
,2
]}

Liu, J-M. ^{[1
,3
]}

机构：

[1] Nanjing Univ, Lab Solid State Microstruct, Nanjing 210093, Jiangsu, Peoples R China

[2] Jiangsu Inst Educ, Dept Phys, Nanjing 210013, Jiangsu, Peoples R China

[3] Chinese Acad Sci, Int Ctr Mat Phys, Shenyang, Peoples R China

来源：

JOURNAL OF APPLIED PHYSICS | 2012年 / 111卷 / 07期

关键词：

STRONTIUM-TITANATE; FERROELECTRICITY; TRANSITION; BEHAVIOR;

D O I：

10.1063/1.3703070

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The dielectric and ferroelectric behaviors of Zn2+-doped SrTiO3 (STO-Zn) have been investigated to explore the effects of Zn-doping on quantum fluctuations and ferroelectric instability. Structurally, the smaller Zn2+ ions occupy the Sr2+ sites at low substitution level up to 0.9% and an over-substitution may lead to impurity phase. It is found that no ferroelectric or relaxor-like anomaly emerges, while significantly enhanced dielectric constant and broad dielectric plateau are identified upon the substitution. These phenomena observed in Zn2+-doped STO are slightly different from well investigated Ca2+-doped STO and additional mechanism besides the off-centrality of Zn2+ ions at Sr2+ sites is possible. The transverse-field Ising model is consulted to explain self-consistently the observed effects. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.3703070]

引用

页数：4

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