Intrinsic ferroelectric polarization of orthorhombic manganites with E-type spin order

被引：64

作者：

Chai, Y. S. ^{[1
]}

Oh, Y. S. ^{[1
]}

Wang, L. J. ^{[2
]}

Manivannan, N. ^{[1
]}

Feng, S. M. ^{[2
]}

Yang, Y. S. ^{[1
]}

Yan, L. Q. ^{[1
,2
]}

Jin, C. Q. ^{[2
]}

Kim, Kee Hoon ^{[1
]}

机构：

[1] Seoul Natl Univ, Dept Phys & Astron, CeNSCMR, Seoul 151747, South Korea

[2] Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China

来源：

PHYSICAL REVIEW B | 2012年 / 85卷 / 18期

基金：

新加坡国家研究基金会;

关键词：

MULTIFERROICS;

D O I：

10.1103/PhysRevB.85.184406

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

By directly measuring electrical hysteresis loops using the Positive-Up Negative-Down (PUND) method, we determined accurately the remanent ferroelectric polarization P-r of orthorhombic RMnO3 (R = Ho, Tm, Yb, and Lu) compounds below their E-type spin ordering temperatures. We found that LuMnO3 has the largest P-r of 0.17 mu C/cm(2) at 6 K in the series, the value of which allows us to predict that its single-crystal form can produce a P-r of at least 0.6 mu C/cm(2) at 0 K. Furthermore, at a fixed temperature, P-r decreases systematically with increasing rare earth ion radius from R = Lu to Ho, exhibiting a strong correlation with the variation of the in-plane Mn-O-Mn bond angle and Mn-O distances. Our experimental results suggest that the contribution of the Mn t(2g) orbitals may dominate the ferroelectric polarization.

引用

页数：6

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