Yu. V. Korkh, E. A. Ponomareva, V. I. Grebennikov, E. G. Gerasimov, R. G. Chumakov, N. V. Mushnikov, T. V. Kuznetsova
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引用次数: 0
摘要
摘要 利用原子力和磁力显微镜观察了 293 K 时 La0.73Dy0.27Mn2Si2 的磁性微观结构特征。磁力图像显示了低对比度磁畴的存在。实验检测了 La0.73Dy0.27Mn2Si2 在冷却到 263 K 温度的过程中光散射的拉曼光谱特性的变化。利用同步辐射，通过共振光发射光谱研究了 La0.73Dy0.27Mn2Si2 的电子结构。电子结构 3d 级和 4d 级的共振显示了价电子的不同特性。利用镝 3d-4f（M4.5 吸收边）共振，确定了价带中镝的 4f 态分布。巨大的镝 4d-4f（N4.5 吸收边）共振时的光辐射是由价带中所有态的贡献决定的，这是因为库仑相互作用的突然介入。确定了价带中 La 的 5p 和 4f 电平、Dy 的 4f 电平以及 Mn 的 3d 电平的能量。
A Study of Rare Earth Intermetallic Compound La0.73Dy0.27Mn2Si2 by Raman Spectroscopy, Magnetic Force Microscopy, and Resonance Photoemission Spectroscopy
Abstract—
The features of magnetic microstructure of La0.73Dy0.27Mn2Si2 at 293 K have been visualized by atomic force and magnetic force microscopy. Magnetic force images reveal the presence of low-contrast magnetic domains. The change of Raman spectral characteristics of light scattering in the process of cooling La0.73Dy0.27Mn2Si2 to a temperature of 263 K is experimentally detected. The electronic structure of La0.73Dy0.27Mn2Si2 is investigated by resonance photoemission spectroscopy with the use of the synchrotron radiation. Resonances at the 3d and 4d levels of electronic structure show different properties of valence electrons. Using the Dy 3d–4f (M4.5 absorption edge) resonance, the distribution of 4f states of dysprosium in the valence band is determined. Photoemission upon the giant Dy 4d–4f (N4.5 absorption edge) resonance is determined by the contribution of all states in the valence band due to the sudden involvement of the Coulomb interaction. The energies of the 5p and 4f levels of La, the 4f level of Dy, and the 3d level of Mn in the valence band are determined.
期刊介绍：
The Physics of Metals and Metallography (Fizika metallov i metallovedenie) was founded in 1955 by the USSR Academy of Sciences. Its scientific profile involves the theory of metals and metal alloys, their electrical and magnetic properties, as well as their structure, phase transformations, and principal mechanical properties. The journal also publishes scientific reviews and papers written by experts involved in fundamental, application, and technological studies. The annual volume of publications amounts to some 250 papers submitted from 100 leading national scientific institutions.
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