Multiferroic phase transitions in manganites RMnO_3：A two-orbital double exchange simulation

The semi-quantum two-orbital exchange model is used to investigate the effect of small rare-earth ion substitution on orthorhombic RMnO 3 with A-type antiferromagnetic order,using the Monte Carlo algorithm,exact diagonalization,and zero-temperature optimization approaches.It is revealed that the sub...

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Published in中国物理B：英文版 Vol. 21; no. 10; pp. 456 - 461
Main Author 陶永梅 林林 董帅 刘俊明
Format Journal Article
LanguageEnglish
Published 01.10.2012
Subjects
双交换
双轨道
反铁磁
模拟
相变
稀土离子
蒙特卡罗算法
铁磁相
Online AccessGet full text
ISSN1674-1056
2058-3834
DOI10.1088/1674-1056/21/10/107502

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Summary:The semi-quantum two-orbital exchange model is used to investigate the effect of small rare-earth ion substitution on orthorhombic RMnO 3 with A-type antiferromagnetic order,using the Monte Carlo algorithm,exact diagonalization,and zero-temperature optimization approaches.It is revealed that the substitution results in a rich multiferroic phase diagram where the coexisting A-type antiferromagnetic phase and spiral spin phase,pure spiral spin phase,coexisting spiral spin phase,the E-type antiferromagnetic phase,and the pure E-type antiferromagnetic phase emerge in sequence.The multiferroic phase transitions modulate substantially the electric polarization,which is consistent qualitatively with recent experiments.
Bibliography:Tao Yong-Mei ,Lin Lin ,Dong Shuai ,and Liu Jun-Ming（1. Laboratory of Solid State Microstructures,Nanjing University,Nanjing 210093,China b） Jiangsu Laboratory of Advanced Functional Materials,Changshu Institute of Technology,Changshu 215500,China
11-5639/O4
multiferroic phase; R-site doping; two-orbital exchange model
The semi-quantum two-orbital exchange model is used to investigate the effect of small rare-earth ion substitution on orthorhombic RMnO 3 with A-type antiferromagnetic order,using the Monte Carlo algorithm,exact diagonalization,and zero-temperature optimization approaches.It is revealed that the substitution results in a rich multiferroic phase diagram where the coexisting A-type antiferromagnetic phase and spiral spin phase,pure spiral spin phase,coexisting spiral spin phase,the E-type antiferromagnetic phase,and the pure E-type antiferromagnetic phase emerge in sequence.The multiferroic phase transitions modulate substantially the electric polarization,which is consistent qualitatively with recent experiments.
ISSN:1674-1056
2058-3834
DOI:10.1088/1674-1056/21/10/107502