ANALYSES OF WAGNER'S MODEL  

Wagner模型自洽性分析(英文)

作　　者：任世伟[1] 姜恩永[1] 侯登录[1] 金英进[1] 白海力[1] 

机构地区：[1]天津大学理学院,天津大学300072

出　　处：《Transactions of Tianjin University》2001年第3期165-166,共2页天津大学学报（英文版）

基　　金：National Natural Science Foundation of China(No.50 0 72 0 1 5) ;Key Teacher Supporting Project (G0 0 0 32 ) ;StartingFoundation for Returned Researchers;Key Projectof Science andTechnology Research of National Education Committee

摘　　要：To achieve a better understanding of the effects of the colossal magnetoresistivity in the mixed valence manganites,the model of a negative magnetoresistivity scaling proposed by Wagner et al is explored in both mathematical and physical analyses.The inconsistency in Wagners model is discussed and corrected. The behaviors of the large spin polarons in Nd 0.52 Sr 0.48 MnO 3 film at T c are studied and analyzed.The results show that only through necessary corrections can Wagners model become self consistent. A further exploration of the nature of the magnetically aligned clusters will make the model more convincing.为深入理解 N d0 .52 Sr0 .48Mn O3薄膜中的庞磁电阻效应 ,运用数学解析以及物理概念分析的方法 ,对 Wagner等人提出的在 Nd0 .52 Sr0 .48Mn O3薄膜中庞磁电阻随磁场变化规律的模型进行了分析 ,并对该模型的自洽性进行了讨论 .结果发现只有通过某些必要的修正 ,Wagner模型方可自洽 .还研究了 Nd0 .52 Sr0 .48Mn O3薄膜中大自旋极化子 (large spin po-larons)在居里温度附近的行为特征 ,发现在居里温度附近磁性团簇的尺寸变化较为异常 。

关 键 词：colossal magnetoresistivity FILM rare earth manganites 

分 类 号：O484.43[理学—固体物理]