Direct observation of incommensurate charge-density wave in overdoped manganites

Direct observation of incommensurate charge-density wave in overdoped manganites
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过掺杂锰氧化物中不相称电荷密度波的直接观察

DOI:
10.1016/j.mtphys.2018.05.003
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发表时间:
2018-06
影响因子:
11.5
通讯作者:
Zhifeng Ren
Zhifeng Ren
中科院分区:
材料科学2区
文献类型:
--
作者:
Yumei Wang;Binghui Ge;Yangxiang Cui;Richeng Yu;Zhifeng Ren

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电荷的起源和轨道排序仍然是争论的主题。在锰酸盐中,电荷排序 (CO) 传统上被认为是 Mn3+ 和 Mn4+ 离子的有序排列。在这里,通过高分辨率透射电子显微镜(HRTEM)结合图像反卷积技术和高维空间描述,与结构调制相关的CO本质被揭示为过掺杂锰氧化物La0.8Ca2.2Mn2O7在实空间中的不通约电荷密度波(CDW)。这一结果解决了当前的争议,并证实了不相称的CO不仅仅是具有不同周期的相称CO的混合物。从这个意义上说,我们为 CDW 图片提供了第一个 HRTEM 成像证据。
The origin of the charge and orbital ordering is still the subject of debate. In manganites, charge ordering (CO) has been traditionally identified as an ordered arrangement of Mn3+and Mn4+ions. Here, by high-resolution transmission electron microscopy (HRTEM) in combination with image deconvolution technique and the high-dimensional space description, the nature of CO related to the structural modulation is revealed as an incommensurate charge-density wave (CDW) in real-space for overdoped manganites La0.8Ca2.2Mn2O7. This result resolves the current controversy and confirms the incommensurate CO is not simply a mixture of commensurate ones with different periodicities. In this sense, we provide the first HRTEM imaging evidence for a CDW picture.
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