Origin of multiferroic spiral spin order in the RMnO3 perovskites

被引：111

作者：

Dong, Shuai ^{[1
,2
,3
]}

Yu, Rong ^{[1
,2
]}

Yunoki, Seiji ^{[4
]}

Liu, J. -M. ^{[3
,5
]}

Dagotto, Elbio ^{[1
,2
]}

机构：

[1] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA

[2] Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA

[3] Nanjing Univ, Nanjing Natl Lab Microstruct, Nanjing 210093, Peoples R China

[4] RIKEN, Inst Phys & Chem Res, Computat Condensed Matter Phys Lab, Wako, Saitama 3510198, Japan

[5] Chinese Acad Sci, Int Ctr Mat Phys, Shenyang 110016, Peoples R China

来源：

PHYSICAL REVIEW B | 2008年 / 78卷 / 15期

基金：

中国国家自然科学基金;

关键词：

D O I：

10.1103/PhysRevB.78.155121

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The origin of the spiral spin order in perovskite multiferroic manganites RMnO3 (R=Tb or Dy) is here investigated using a two e(g)-orbital double-exchange model. Our main result is that the experimentally observed spiral phase can be stabilized by introducing a relatively weak next-nearest-neighbor superexchange coupling (similar to 10% of the nearest-neighbor superexchange). Moreover, the Jahn-Teller lattice distortion is also shown to be essential to obtain a realistic spiral period. Supporting our conclusions, the generic phase diagram of undoped perovskite manganites is obtained using Monte Carlo simulations, showing phase transitions from the A-type antiferromagnet, to the spiral phase, and finally to the E-type antiferromagnet, with decreasing size of the R ions. These results are qualitatively explained by the enhanced relative intensity of the superexchanges.

引用

页数：6

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