Orbitally induced Peierls state in spinels
Orbitally induced Peierls state in spinels
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DOI：
10.1103/physrevlett.94.156402
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发表时间：
2005-04-22
影响因子：
8.6
通讯作者：
Mizokawa, T
中科院分区：
文献类型：
--
作者：
Khomskii, DI;Mizokawa, T
我们考虑的超结构，它可以形成在尖晶石上含有B网站的过渡金属离子与部分填充的t（2g）能级。我们表明，当这样的系统接近巡回状态（例如，具有绝缘体-金属转变），则可能在它们中出现轨道驱动的Peierls态。我们解释了这种机制中观察到的非常不寻常的超结构CuIr 2S 4（八聚体）和MgTi 2 O 4（手性超结构），并建议，类似的现象应观察到在NaTiO 2和可能在其他一些系统。
We consider the superstructures, which can be formed in spinels containing on B sites the transition-metal ions with partially filled t(2g) levels. We show that, when such systems are close to the itinerant state (e.g., have an insulator-metal transition), there may appear in them an orbitally driven Peierls state. We explain by this mechanism the very unusual superstructures observed in CuIr2S4 (octamers) and MgTi2O4 (chiral superstructures) and suggest that a similar phenomenon should be observed in NaTiO2 and possibly in some other systems.