Double-exchange model: phase separation versus canted spins

被引:130
作者
Kagan, MY
Khomskii, DI
Mostovoy, MV
机构
[1] PL Kapitza Phys Problems Inst, Moscow 117334, Russia
[2] Univ Groningen, NL-9747 AG Groningen, Netherlands
关键词
D O I
10.1007/s100510050998
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
We study the competition between different possible ground states of the double-exchange model with strong ferromagnetic exchange interaction between itinerant electrons and local spins. Both for classical and quantum treatment of the local spins the homogeneous canted state is shown to be unstable against a phase separation. The conditions for the phase separation into the mixture of the antiferromagnetic and ferromagnetic/canted states are given. We also discuss another possible realization of the phase-separated state: ferromagnetic polarons embedded into an antiferromagnetic surrounding. The general picture of a percolated state, which emerges from these considerations, is discussed and compared with results of recent experiments on doped manganaties.
引用
收藏
页码:217 / 223
页数:7
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