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

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

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.

Keywords: multiferroics dielectric loss La_0.5Ca_0.5MnO₃

Received: 08 December 2012
Revised: 08 January 2013
Accepted manuscript online:

PACS:	77.22.Gm	(Dielectric loss and relaxation)
	77.84.Lf	(Composite materials)
	85.35.Ds	(Quantum interference devices)

Fund: 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).

Corresponding Authors: Cao Xian-Sheng
E-mail: caoxs@nwpu.edu.cn

Cite this article:

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 2013 Chin. Phys. B 22 087702

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

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