Direct observation of orbital ordering in La0.5Sr1.5MnO4 using soft x-ray diffraction.
Direct observation of orbital ordering in La0.5Sr1.5MnO4 using soft x-ray diffraction.
复制标题
使用软 X 射线衍射直接观察 La0.5Sr1.5MnO4 中的轨道排序。
DOI：
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发表时间：
2003
影响因子：
8.6
通讯作者：
A. Boothroyd
中科院分区：
文献类型：
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作者：
S. Wilkins;P. D. Spencer;P. Hatton;Sean P. Collins;M. Roper;D. Prabhakaran;A. Boothroyd
我们报告的第一个直接共振软x射线散射观测轨道排序。我们已经研究了低温相的La0.5Sr1.5MnO4，显示电荷和轨道有序的化合物。先前关于这种材料中轨道有序性的说法依赖于锰K边缘的观测。这些说法在一些理论研究中受到质疑。相反，我们采用了共振软X射线散射在锰L（III）和L（II）的边缘，直接探测轨道排序。在恒定波矢量的能量扫描进行比较，理论预测，并建议在所有温度下有两个单独的贡献的散射：直接轨道排序和强合作的Jahn-Teller扭曲的Mn 3+离子。
We report the first direct resonant soft x-ray scattering observations of orbital ordering. We have studied the low temperature phase of La0.5Sr1.5MnO4, a compound that displays charge and orbital ordering. Previous claims of orbital ordering in such materials have relied on observations at the manganese K edge. These claims have been questioned in several theoretical studies. Instead we have employed resonant soft x-ray scattering at the manganese L(III) and L(II) edges which probes the orbital ordering directly. Energy scans at constant wave vector are compared to theoretical predictions and suggest that at all temperatures there are two separate contributions to the scattering: direct orbital ordering and strong cooperative Jahn-Teller distortions of the Mn3+ ions.