中国物理B ›› 2015, Vol. 24 ›› Issue (3): 37509-037509.doi: 10.1088/1674-1056/24/3/037509

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

Quantitative calculations of polarizations arising from the symmetric and antisymmetric exchange strictions in Tm-doped GdMnO3

秦明辉a, 林林b, 李林b, 贾兴涛c, 刘俊明b   

  1. a Institute for Advanced Materials and Laboratory of Quantum Engineering and Quantum Materials, South China Normal University, Guangzhou 510006, China;
    b Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China;
    c School of Physics and Chemistry, Henan Polytechnic University, Jiaozuo 454000, China
  • 收稿日期:2014-09-12 修回日期:2014-10-15 出版日期:2015-03-05 发布日期:2015-03-05
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 11204091, 11274094, and 51332007) and the National Basic Research Program of China (Grant Nos. 2015CB921202 and 2011CB922101).

Quantitative calculations of polarizations arising from the symmetric and antisymmetric exchange strictions in Tm-doped GdMnO3

Qin Ming-Hui (秦明辉)a, Lin Lin (林林)b, Li Lin (李林)b, Jia Xing-Tao (贾兴涛)c, Liu Jun-Ming (刘俊明)b   

  1. a Institute for Advanced Materials and Laboratory of Quantum Engineering and Quantum Materials, South China Normal University, Guangzhou 510006, China;
    b Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China;
    c School of Physics and Chemistry, Henan Polytechnic University, Jiaozuo 454000, China
  • Received:2014-09-12 Revised:2014-10-15 Online:2015-03-05 Published:2015-03-05
  • Contact: Qin Ming-Hui, Liu Jun-Ming E-mail:qinmh@scnu.edu.cn;liujm@nju.edu.cn
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 11204091, 11274094, and 51332007) and the National Basic Research Program of China (Grant Nos. 2015CB921202 and 2011CB922101).

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摘要：

The ferroelectric polarization and phase diagram in Tm-doped GdMnO3 are studied by means of Monte Carlo simulation based on the Mochizuki-Furukawa model. Our work well reproduces the low temperature polarization at various substitution levels observed experimentally. It is demonstrated that the Tm-doping can control the multiferroic behaviors through modulating the spin structures, resulting in the flop of the electric polarization. In addition, the polarization in the ab-plane cycloidal spin phase arises from comparable contributions of the symmetric exchange striction and antisymmetric exchange striction, leading to much bigger polarization than that in the bc-plane cycloidal spin phase where only the contribution of the latter striction is available. The phase diagram obtained in our simulation is helpful for clarifying the multiferroic properties in doped manganite systems and other related multiferroics.

关键词: multiferroics, cycloidal spin order, polarization, Monte Carlo simulation

Abstract:

The ferroelectric polarization and phase diagram in Tm-doped GdMnO3 are studied by means of Monte Carlo simulation based on the Mochizuki-Furukawa model. Our work well reproduces the low temperature polarization at various substitution levels observed experimentally. It is demonstrated that the Tm-doping can control the multiferroic behaviors through modulating the spin structures, resulting in the flop of the electric polarization. In addition, the polarization in the ab-plane cycloidal spin phase arises from comparable contributions of the symmetric exchange striction and antisymmetric exchange striction, leading to much bigger polarization than that in the bc-plane cycloidal spin phase where only the contribution of the latter striction is available. The phase diagram obtained in our simulation is helpful for clarifying the multiferroic properties in doped manganite systems and other related multiferroics.

Key words: multiferroics, cycloidal spin order, polarization, Monte Carlo simulation

中图分类号:  (Magnetomechanical effects, magnetostriction)

  • 75.80.+q
75.30.Kz (Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)) 77.80.-e (Ferroelectricity and antiferroelectricity)