Domain-enhanced interlayer coupling in ferroelectric/paraelectric superlattices

被引：151
|
作者：
Stephanovich, VA [1 ]
Luk'yanchuk, IA
Karkut, MG
机构：
[1] Univ Opole, Inst Math & Informat, PL-45052 Opole, Poland
[2] Univ Picardie, Lab Condensed Matter Phys, F-80039 Amiens, France
[3] LD Landau Theoret Phys Inst, RAS, Moscow 117940, Russia
来源：
PHYSICAL REVIEW LETTERS | 2005年 / 94卷 / 04期
关键词：
D O I：
10.1103/PhysRevLett.94.047601
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We investigate the ferroelectric phase transition and domain formation in a periodic superlattice consisting of alternate ferroelectric (FE) and paraelectric (PE) layers of nanometric thickness. We find that the polarization domains formed in the different FE layers can interact with each other via the PE layers. By coupling the electrostatic equations with those obtained by minimizing the Ginzburg-Landau functional, we calculate the critical temperature of transition T-c as a function of the FE/PE superlattice wavelength Lambda and quantitatively explain the recent experimental observation of a thickness dependence of the ferroelectric transition temperature in KTaO3/KNbO3 strained-layer superlattices.
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页数：4
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