Dielectric loss of half-doped manganite La0.5Ca0.5MnO3

doi:10.1088/1674-1056/22/8/087702

中国物理B ›› 2013, Vol. 22 ›› Issue (8): 87702-087702.doi: 10.1088/1674-1056/22/8/087702

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

Dielectric loss of half-doped manganite La_0.5Ca_0.5MnO₃

曹先胜^a, 吉高峰^{a b}, 罗炳成^c, 李峰^a

a School of Mathematics and Physics, Changzhou University, Changzhou 213164, China;
b Department of Microelectronics, State Key Laboratory of ASIC and Systems, Fudan University, Shanghai 200433, China;
c Shaanxi Key Laboratory of Condensed Matter Structures and Properties,School of Science, Northwestern Polytechnical University, Xi'an 710072, China

收稿日期:2012-12-08 修回日期:2013-01-08 出版日期:2013-06-27 发布日期:2013-06-27
基金资助:
Project supported by the Priming Scientific Research Foundation of Changzhou University, China (Grant Nos. ZMF1002133 and ZMF09020023) and the National Natural Science Foundation of China (Grant No. 51202195).

Dielectric loss of half-doped manganite La_0.5Ca_0.5MnO₃

Cao Xian-Sheng (曹先胜)^a, Ji Gao-Feng (吉高峰)^{a b}, Luo Bing-Cheng (罗炳成)^c, Li Feng (李峰)^a

a School of Mathematics and Physics, Changzhou University, Changzhou 213164, China;
b Department of Microelectronics, State Key Laboratory of ASIC and Systems, Fudan University, Shanghai 200433, China;
c Shaanxi Key Laboratory of Condensed Matter Structures and Properties,School of Science, Northwestern Polytechnical University, Xi'an 710072, China

Received:2012-12-08 Revised:2013-01-08 Online:2013-06-27 Published:2013-06-27
Contact: Cao Xian-Sheng E-mail:caoxs@nwpu.edu.cn
Supported by:
Project supported by the Priming Scientific Research Foundation of Changzhou University, China (Grant Nos. ZMF1002133 and ZMF09020023) and the National Natural Science Foundation of China (Grant No. 51202195).

摘要/Abstract

摘要： The dielectric loss tanδ of half-doped manganite La_0.5Ca_0.5MnO₃ is investigated using Green's function technique. The La_0.5Ca_0.5MnO₃ is described by the Kondo-lattice model in the double exchange limit, taking into account the Jahn-Teller distortion and the super-exchange interaction between the localized electrons. It is found that the intensity of tanδ decreases with increasing |ε_JT|, V, and U. It is also observed that the transition temperature T_P rises as |ε_JT| and U increase. It is worth noting that T_P remains unchanged and the strength of tanδ increases with increasing g. The calculated dielectric loss results are explained theoretically, and these behaviors are in qualitative agreement with the experimental results.

关键词: multiferroics, dielectric loss, La_0.5Ca_0.5MnO₃

Abstract: The dielectric loss tanδ of half-doped manganite La_0.5Ca_0.5MnO₃ is investigated using Green's function technique. The La_0.5Ca_0.5MnO₃ is described by the Kondo-lattice model in the double exchange limit, taking into account the Jahn-Teller distortion and the super-exchange interaction between the localized electrons. It is found that the intensity of tanδ decreases with increasing |ε_JT|, V, and U. It is also observed that the transition temperature T_P rises as |ε_JT| and U increase. It is worth noting that T_P remains unchanged and the strength of tanδ increases with increasing g. The calculated dielectric loss results are explained theoretically, and these behaviors are in qualitative agreement with the experimental results.

Key words: multiferroics, dielectric loss, La_0.5Ca_0.5MnO₃

中图分类号: (Dielectric loss and relaxation)

77.22.Gm

77.84.Lf (Composite materials) 85.35.Ds (Quantum interference devices)

曹先胜, 吉高峰, 罗炳成, 李峰. Dielectric loss of half-doped manganite La_0.5Ca_0.5MnO₃[J]. 中国物理B, 2013, 22(8): 87702-087702.

Cao Xian-Sheng (曹先胜), Ji Gao-Feng (吉高峰), Luo Bing-Cheng (罗炳成), Li Feng (李峰). Dielectric loss of half-doped manganite La_0.5Ca_0.5MnO₃[J]. Chin. Phys. B, 2013, 22(8): 87702-087702.

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Dielectric loss of half-doped manganite La_0.5Ca_0.5MnO₃

Dielectric loss of half-doped manganite La_0.5Ca_0.5MnO₃

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