Double-exchange ferromagnetism in La(Mn1-xCox)O-3

被引:120
作者
Park, JH
Cheong, SW
Chen, CT
机构
[1] AT&T BELL LABS, LUCENT TECHNOL, MURRAY HILL, NJ 07974 USA
[2] SYNCHROTRON RADIAT RES CTR, HSINCHU 300, TAIWAN
关键词
D O I
10.1103/PhysRevB.55.11072
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We have investigated the appearance of ferromagnetism in a mixture of nonferromagnets LaMnO3 and LaCoO3, without heterovalent ion substitution in La sites. LaMn0.85Co0.15O3 and La0.7Sr0.3Mn0.8Co0.2O3 are studied by using x-ray-absorption and resonant photoemission spectroscopies, The results show that the dopant Co in LaMn1-xCoxO3 becomes divalent rather than expected trivalent and induces Mn3+-Mn4+ mixed valence states. Therefore, at variance with the earlier proposal of a structure-induced Mn3+-Mn3+ ferromagnetic coupling, the ferromagnetic state in LaMn1-xCoxO3 is consistent with the Mn3+-Mn4+ double-exchange mechanism.
引用
收藏
页码:11072 / 11075
页数:4
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