Dielectric loss of half-doped manganite Lao.sCao.sMnO3

The dielectric loss tanfi of half-doped manganite Lao.sCao.sMnO3 is investigated using Green＇s function technique. The Lao.sCao.sMnO3 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 l...

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Bibliographic Details
Published in:中国物理B：英文版 2013 (8), p.637-640
Main Author: 曹先胜 吉高峰 罗炳成 李峰
Format: Article
Language:English
Subjects:
Jahn-Teller畸变
交换相互作用
介电损耗
介质损耗
掺杂
晶格模型
格林函数
锰氧化物
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Summary:The dielectric loss tanfi of half-doped manganite Lao.sCao.sMnO3 is investigated using Green＇s function technique. The Lao.sCao.sMnO3 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 tans decreases with increasing [e]TI, V, and U. It is also observed that the transition temperature Tp rises as l eJTI and U increase. It is worth noting that Tp remains unchanged and the strength of tans increases with increasing g. The calculated dielectric loss results are explained theoretically, and these behaviors are in qualitative agreement with the experimental results.
ISSN:1674-1056
2058-3834