Structural and magnetic phase diagram an room temperature CMR effect of La1-xAgxMnO3

被引：131

作者：

Pi, L ^{[1
]}

Hervieu, M ^{[1
]}

Maignan, A ^{[1
]}

Martin, C ^{[1
]}

Raveau, B ^{[1
]}

机构：

[1] ISMRA Univ Caen, CNRS, UMR 6508, Lab CRISMAT, F-14050 Caen 4, France

来源：

SOLID STATE COMMUNICATIONS | 2003年 / 126卷 / 04期

关键词：

colossal magnetoresistance; double exchange; phase transition;

D O I：

10.1016/S0038-1098(02)00890-6

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The study of the structural and magnetic phase diagram of the manganites La1-xAgxMnO3 shows similarity with the La1-x'Srx'MnO3 series, involving a metallic ferromagnetic domain at relatively high temperature (approximate to 300 K). The Ag-system differs from the Sr-one by a much smaller homogeneity range (x less than or equal to 1/6) and the absence of charge ordering. But the most important feature of the Ag-manganites deals with the exceptionally high magnetoresistance (-25%) at room temperature under 1.2 T, that. appears, for the composition x = 1/6. The latter is interpreted as the coincidence of the optimal double exchange condition (Mn3+:Mn4+ = 2) with T-max = 300 K (maximum of the rho(T) curve in zero field). (C) 2003 Elsevier Science Ltd. All rights reserved.

引用

页码：229 / 234

页数：6

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