Colossal magnetoresistance in Sr2-xNd1+xMn2O7 (x=0.0,0.1)

被引：81

作者：

Battle, PD ^{[1
]}

Blundell, SJ ^{[1
]}

Green, MA ^{[1
]}

Hayes, W ^{[1
]}

Honold, M ^{[1
]}

Klehe, AK ^{[1
]}

Laskey, NS ^{[1
]}

Millburn, JE ^{[1
]}

Murphy, L ^{[1
]}

Rosseinsky, MJ ^{[1
]}

Samarin, NA ^{[1
]}

Singleton, J ^{[1
]}

Sluchanko, NE ^{[1
]}

Sullivan, SP ^{[1
]}

Vente, JF ^{[1
]}

机构：

[1] UNIV OXFORD,CLARENDON LAB,DEPT PHYS,OXFORD OX1 3PU,ENGLAND

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 1996年 / 8卷 / 32期

关键词：

D O I：

10.1088/0953-8984/8/32/001

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Magnetization and magnetotransport measurements have been used to study the composition dependence of the electronic properties of the Ruddlesden-Popper phases Sr2NdMn2O7 and Sr1.9Nd1.1Mn2O7. Although their behaviour differs in detail, both compounds show a colossal magnetoresistance (CMR) effect (>10 000% in 14 T) in the temperature range 4.2 less than or equal to T/K less than or equal to 100. However, neither material shows a transition to a ferromagnetic state above 4.2 K, and both materials have higher resistivities (> 10(3) Omega cm for 4.2 less than or equal to T/K less than or equal to 100) than the metallic oxides previously found to show CMR. In view of the low conductivity and the absence of ferromagnetism, the CMR of these phases is not readily explained by a double-exchange mechanism.

引用

页码：L427 / L434

页数：8

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