Spin-glass behavior and giant magnetoresistance in the (RE)Ni0.3Co0.7O3 (RE = La,Nd,Sm) system

被引：81

作者：

Perez, J ^{[1
]}

Garcia, J ^{[1
]}

Blasco, J ^{[1
]}

Stankiewicz, J ^{[1
]}

机构：

[1] Univ Zaragoza, Fac Ciencias, Inst Ciencia Mat Aragon, CSIC, E-50009 Zaragoza, Spain

来源：

PHYSICAL REVIEW LETTERS | 1998年 / 80卷 / 11期

关键词：

D O I：

10.1103/PhysRevLett.80.2401

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

(RE)Ni0.3Co0.7O3 (RE = La,Nd,Sm) oxides with the perovskite structure have been studied. All of these compounds show a spin-glass behavior at low temperatures. Isostructural compounds in which Ni or Co are replaced by a nonmagnetic element do not show spin-glass behavior. Therefore, simultaneous presence of Ni and Co is needed to develop competitive ferro-and antiferromagnetic interactions in the (RE)Ni0.3Co0.7O3 compounds. Moreover, large negative magnetoresistance below freezing temperature is observed in these samples. We conclude the existence of an electronic transfer between Ni3+ and Co3+ ions in these compounds which gives rise to ferromagnetic interactions.

引用

页码：2401 / 2404

页数：4

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