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首页> 外文期刊>Nano letters >Experimental Evidence of the Origin of Nanophase Separation in Low Hole-Doped Colossal Magnetoresistant Manganites
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Experimental Evidence of the Origin of Nanophase Separation in Low Hole-Doped Colossal Magnetoresistant Manganites

机译：低孔掺杂巨磁致锰矿中纳米相分离成因的实验证据

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摘要

While being key to understanding their intriguing physical properties, the origin of nanophase separation in manganites and other strongly correlated materials is still unclear. Here, experimental evidence is offered for the origin of the controverted phase separation mechanism in the representative La1-xCaxMnO3 system. For low hole densities, direct evidence of Mn4+ holes localization around Ca2+ ions is experimentally provided by means of aberration-corrected scanning transmission electron microscopy combined with electron energy loss spectroscopy. These localized holes give rise to the segregated nanoclusters, within which double exchange hopping between Mn3+ and Mn4+ remains restricted, accounting for the insulating character of perovskites with low hole density. This localization is explained in terms of a simple model in which Mn4+ holes are bound to substitutional divalent Ca2+ ions.
机译：尽管是了解它们有趣的物理特性的关键，但锰矿和其他高度相关的材料中纳米相分离的起源仍不清楚。在这里，为代表性的La1-xCaxMnO3系统中有争议的相分离机理的起源提供了实验证据。对于低空穴密度，通过像差校正扫描透射电子显微镜结合电子能量损失谱，通过实验提供了Mn4 +空穴在Ca2 +离子周围的直接证据。这些局部的空穴产生了分离的纳米团簇，其中Mn3 +和Mn4 +之间的双重交换跳变仍然受到限制，这说明了具有低空穴密度的钙钛矿的绝缘特性。用一个简单的模型解释了这种定位，在该模型中，Mn4 +空穴与取代的二价Ca2 +离子结合。

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