Phase separation in systems with charge ordering
Phase separation in systems with charge ordering
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DOI：
10.1134/1.1402742
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发表时间：
2000-01
影响因子：
1.1
通讯作者：
M. Kagan;K. Kugel;D. Khomskii
中科院分区：
文献类型：
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作者：
M. Kagan;K. Kugel;D. Khomskii
一个简单的模型的电荷排序被认为是。它明确表明，在任何偏离半填充（n <$1/2），该系统是不稳定的相分离成电荷有序区域withn=1/2和具有较小的电子或空穴密度的金属区域。这种相分离状态（金属液滴的电荷有序矩阵）的一种可能的结构进行了讨论。该模型被扩展到占强洪规则现场耦合和较弱的反铁磁交换。对这个扩展模型的分析使我们能够确定相分离态的磁性结构，并揭示锰氧化物和其他具有电荷有序性的物质的特征。
A simple model of charge ordering is considered. It is explicitly shown that at any deviation from half-filling(n≠1/2), the system is unstable with respect to the phase separation into the charge ordered regions withn=1/2 and the metallic regions with a smaller electron or hole density. A possible structure of this phase-separated state (metallic droplets in a charge ordered matrix) is discussed. The model is extended to account for the strong Hund-rule onsite coupling and the weaker intersite antiferromagnetic exchange. The analysis of this extended model allows us to determine the magnetic structure of the phase-separated state and to reveal the characteristic features of the manganites and other substances with charge ordering.