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Multiferroic phase transitions in manganites RMnO3: A two-orbital double exchange simulation |
| Tao Yong-Mei (陶永梅)a b, Lin Lin (林林)a, Dong Shuai (董帅)a, Liu Jun-Ming (刘俊明)a |
a Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China;
b Jiangsu Laboratory of Advanced Functional Materials, Changshu Institute of Technology, Changshu 215500, China |
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Abstract The semi-quantum two-orbital exchange model is used to investigate the effect of small rare-earth ion substitution on orthorhombic RMnO3 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.
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Received: 16 February 2012
Revised: 24 February 2012
Accepted manuscript online:
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PACS:
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75.47.Lx
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(Magnetic oxides)
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64.75.Gh
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(Phase separation and segregation in model systems (hard spheres, Lennard-Jones, etc.))
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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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64.70.Rh
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(Commensurate-incommensurate transitions)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 51031004, 11004027, and 11074113), the National Basic Research Program of China (Grant Nos. 2011CB922101 and 2009CB929501), and the Priority Academic Program Development of Jiangsu Provincial Higher Education Institutions, China. |
Corresponding Authors:
Liu Jun-Ming
E-mail: liujm@nju.edu.cn
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Cite this article:
Tao Yong-Mei (陶永梅), Lin Lin (林林), Dong Shuai (董帅), Liu Jun-Ming (刘俊明) Multiferroic phase transitions in manganites RMnO3: A two-orbital double exchange simulation 2012 Chin. Phys. B 21 107502
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