Magnetic-ion-induced displacive electric polarization in FeO5 bipyramidal units of (Ba,Sr)Fe12O19 hexaferrites

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	Magnetic-ion-induced displacive electric polarization in FeO5 bipyramidal units of (Ba,Sr)Fe12O19 hexaferrites
	Shen, SP ; Chai, YS ; Cong, JZ ; Sun, PJ ; Lu, J ; Yan, LQ ; Wang, SG ; Sun, Y
刊名	PHYSICAL REVIEW B
	2014
卷号	90 期号:18
ISSN号	1098-0121
通讯作者	Shen, SP (reprint author), Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Inst Phys, Beijing 100190, Peoples R China.
中文摘要	Electric polarization in conventional paraelectric/ferroelectric oxides usually involves the displacement of nonmagnetic transition-metal ions with an empty d shell. Here we unravel an unusual mechanism for electric polarization based on the displacement of magnetic Fe3+ (3d(5)) ions. Our simulations suggest that the competition between the long-range Coulomb interaction and short-range Pauli repulsion in a FeO5 bipyramidal unit with proper lattice parameters would favor an off-center displacement of Fe3+, which directly induces a local electric dipole. As a prototype example, we show that the electric dipole of a FeO5 bipyramid in (Ba,Sr)Fe12O19 hexaferrites leads to a different family of magnetic quantum paraelectrics. The manipulation of this unique magnetic-ion-induced displacive electric polarization in a FeO5 bipyramid could open up a promising route to generating unconventional dielectrics, ferroelectrics, and multiferroics.
资助信息	Natural Science Foundation of China [11227405, 11374347]; National Key Basic Research Program of China [2011CB921801]; Strategic Priority Research Program of the Chinese Academy of Sciences [XDB07030200]
语种	英语
公开日期	2015-04-14
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/59497]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Shen, SP,Chai, YS,Cong, JZ,et al. Magnetic-ion-induced displacive electric polarization in FeO5 bipyramidal units of (Ba,Sr)Fe12O19 hexaferrites[J]. PHYSICAL REVIEW B,2014,90(18).
APA	Shen, SP.,Chai, YS.,Cong, JZ.,Sun, PJ.,Lu, J.,...&Sun, Y.(2014).Magnetic-ion-induced displacive electric polarization in FeO5 bipyramidal units of (Ba,Sr)Fe12O19 hexaferrites.PHYSICAL REVIEW B,90(18).
MLA	Shen, SP,et al."Magnetic-ion-induced displacive electric polarization in FeO5 bipyramidal units of (Ba,Sr)Fe12O19 hexaferrites".PHYSICAL REVIEW B 90.18(2014).