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

被引:42
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
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.
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页码:4538 / 4540
页数:3
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