Colossal magnetoresistance in the antiferromagnetic La0.5Ca0.5MnO3 system

被引：43

作者：

Gong, GQ ^{[1
]}

Canedy, CL ^{[1
]}

Xiao, G ^{[1
]}

Sun, JZ ^{[1
]}

Gupta, A ^{[1
]}

Gallagher, WJ ^{[1
]}

机构：

[1] IBM CORP, DIV RES, YORKTOWN HTS, NY 10598 USA

来源：

JOURNAL OF APPLIED PHYSICS | 1996年 / 79卷 / 08期

关键词：

D O I：

10.1063/1.362564

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We have explored the colossal magnetoresistance (CMR) effect in the antiferromagnetic La0.5Ca0.5MnO3 compound. In the absence of a magnetic field (H), the solid is a canted antiferromagnetic (AFM) insulator. An applied H in the Tesla scale induces a first order AFM to FM phase transition, and correspondingly, an insulator to metal transition. The observed CMR is attributed to the H-induced charge localization-delocalization behavior associated with the AFM-FM transition. At low temperatures (T<100 K), the solid remains in the AFM phase, where we have observed a phenomenal one millionfold change in resistivity between 0 and 8 Tesla. The origin of CMR in low T-region is a thermal activation energy gap which is strongly dependent on H. (C) 1996 American Institute of Physics.

引用

页码：4538 / 4540

页数：3

共 12 条

[1] CONSIDERATIONS ON DOUBLE EXCHANGE [J].