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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 |
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 |
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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.
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Received: 12 September 2014
Revised: 15 October 2014
Accepted manuscript online:
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PACS:
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75.80.+q
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(Magnetomechanical effects, magnetostriction)
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75.30.Kz
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(Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.))
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77.80.-e
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(Ferroelectricity and antiferroelectricity)
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| Fund: 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). |
Corresponding Authors:
Qin Ming-Hui, Liu Jun-Ming
E-mail: qinmh@scnu.edu.cn;liujm@nju.edu.cn
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Cite this article:
Qin Ming-Hui (秦明辉), Lin Lin (林林), Li Lin (李林), Jia Xing-Tao (贾兴涛), Liu Jun-Ming (刘俊明) Quantitative calculations of polarizations arising from the symmetric and antisymmetric exchange strictions in Tm-doped GdMnO3 2015 Chin. Phys. B 24 037509
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