Orbital polarons and ferromagnetic insulators in manganites
Orbital polarons and ferromagnetic insulators in manganites
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DOI：
10.1103/physrevb.63.024403
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发表时间：
2001-01-01
影响因子：
3.7
通讯作者：
Sawatzky, GA
中科院分区：
文献类型：
--
作者：
Mizokawa, T;Khomskii, DI;Sawatzky, GA
我们认为，在轻空穴掺杂的钙钛矿型锰氧化物的空穴（Mn 4+网站）是由最近的邻居Mn 3+网站，其中占据的3d轨道有其叶指向中心的空穴（Mn 4+）网站和自旋铁磁耦合到中心自旋包围。这个复合体可以看作是一个轨道-自旋-晶格复合极化子，伴随着呼吸型（Mn ~（4+））和Jahn-Teller型（Mn ~（3+））局域晶格畸变。我们目前的计算表明，对于某些掺杂水平，这些轨道极化子可以结晶成一个电荷和轨道有序的铁磁绝缘状态。
We argue that in lightly hole doped perovskite-type Mn oxides the holes (Mn4+ sites) are surrounded by nearest neighbor Mn3+ sites in which the occupied 3d orbitals have their lobes directed towards the central hole (Mn4+) site and with spins coupled ferromagnetically to the central spin. This composite object, which can be viewed as a combined orbital-spin-lattice polaron, is accompanied by the breathing type (Mn4+) and Jahn-Teller type (Mn3+) local lattice distortions. We present calculations which indicate that for certain doping levels these orbital polarons may crystallize into a charge and orbitally ordered ferromagnetic insulating state.