Influence of grain size and grain boundaries on the properties of La0.7Sr0.3CoxMn1-xO3

被引：34
作者：
Das, S
Chowdhury, P
Rao, TKG
Das, D
Bahadur, D
机构：
[1] Indian Inst Technol, Dept Met Engn & Mat Sci, Bombay 400076, Maharashtra, India
[2] Indian Inst Technol, Reg Sophisticated Instrumentat Ctr, Bombay 400076, Maharashtra, India
来源：
SOLID STATE COMMUNICATIONS | 2002年 / 121卷 / 12期
关键词：
maganites; resistivity; magnetoresistivity; electron spin resonance; grain boundary;
D O I：
10.1016/S0038-1098(02)00046-7
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
We have synthesized La0.7Sr0.3Mn0.9Co0.1O3 granular perovskites using ethylenediaminetetraacetic acid (EDTA) as a complexing, agent. The influence of grain size and grain boundary structure on the physical properties was investigated. Our results show that decreasing grain size leads to lowering of the ferromagnetic transition temperature, broadening of the transition, decrease in magnetization and enhancement of resistivity and magnetoresistance at low temperatures. Also, electron spin resonance linewidth and g-value will decrease. These results are explained by spin dependent scattering at the grain boundaries and weakening of magnetic interaction near the surface of grains, which reduces the internal field in the system. (C) 2002 Published by Elsevier Science Ltd.
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收藏
页码：691 / 695
页数：5
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