Origin of ferroelectricity in the multiferroic barium fluorides BaMF4:: A first principles study

被引：90

作者：

Ederer, Claude ^{[1
]}

Spaldin, Nicola A. ^{[1
]}

机构：

[1] Univ Calif Santa Barbara, Dept Mat, Santa Barbara, CA 93106 USA

来源：

PHYSICAL REVIEW B | 2006年 / 74卷 / 02期

关键词：

D O I：

10.1103/PhysRevB.74.024102

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We present a first-principles study of the series of multiferroic barium fluorides with the composition BaMF4, where M is Mn, Fe, Co, or Ni. We discuss trends in the structural, electronic, and magnetic properties, and we show that the ferroelectricity in these systems results from the freezing in of a single unstable polar phonon mode. In contrast to the case of the standard perovskite ferroelectrics, this structural distortion is not accompanied by charge transfer between cations and anions. Thus, the ferroelectric instability in the multiferroic barium fluorides arises solely due to size effects and the special geometrical constraints of the underlying crystal structure.

引用

页数：8

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