Role of grain boundaries in double exchange manganite oxides La(1-x)A(x)MnO(3) (A=Ba, Ca)

被引：98

作者：

Ju, HL ^{[1
]}

Sohn, H ^{[1
]}

机构：

[1] UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720

来源：

SOLID STATE COMMUNICATIONS | 1997年 / 102卷 / 06期

关键词：

magnetically ordered materials; grain boundary; electronic transport;

D O I：

10.1016/S0038-1098(97)00031-8

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We report the study of magnetotransport and magnetic properties of manganite oxides La(1-x)A(x)MnO(3) (A = Ba, Ca). We have observed that polycrystalline manganite shows a different resistivity behavior from that of single crystalline material in that the former shows a small rho(P)/rho(5 K) (rho (P): peak resistivity, rho(5 K): resistivity at 5 K) ratio and a large magnetoresistance (MR) effect at T much less than T-c, whereas the latter shows a large rho(P)/rho(5 K) ratio and no significant MR at low temperature, due to grain boundary contribution to the resistivity. A La0.67Ba0.33MnO2.99 sample with a polycrystal size of 5 mu m showed the grain boundary resistivity 150 times as large as the grain resistivity at 5 K. A possible origin of low-field MR in polycrystalline manganites has been discussed. (C) 1997 Elsevier Science Ltd.

引用

页码：463 / 466

页数：4

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