Relaxor ferroelectric behavior in Ca-doped TbMnO3

被引：28
作者：
Mufti, N. [1 ]
Nugroho, A. A. [1 ,2 ]
Blake, G. R. [1 ]
Palstra, T. T. M. [1 ]
机构：
[1] Univ Groningen, Zernike Inst Adv Mat, Solid State Chem Lab, NL-9747 AG Groningen, Netherlands
[2] Inst Teknol Bandung, Fac Math & Nat Sci, Bandung 40132, Indonesia
来源：
PHYSICAL REVIEW B | 2008年 / 78卷 / 02期
关键词：
D O I：
10.1103/PhysRevB.78.024109
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We have studied the effect of Ca-doping in single-crystal Tb1-xCaxMnO3(x <= 0.1) on the crystal and magnetic structure, magnetocapacitance, and electric polarization. For low doping (x=0.05), the presence of Mn4+ ions gives rise to a state with behavior resembling that of a relaxor ferroelectric. The coherence length of the Mn magnetic spin spiral is reduced, while the Mn-modulation wave vector is unchanged. For doping larger than 5%, the ferroelectric state is suppressed, which we ascribe to breakdown of the spiral magnetic structure.
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页数：5
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