Atomic Vibrational Dynamics of Thin Films Studied by Nuclear Resonant Inelastic X-Ray Scattering: Amorphous Tb_1−xFe_x Alloys

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• 作者：Ruckert ; T. ; Keune ; W. ; Sahoo ; B. ; Sturhahn ; W. ; Toellner ; T. S. ; Alp ; E. E. ; Rö ; hlsberger ; R.
• 刊名：Hyperfine Interactions
• 出版时间：2002
• 出版年：2002
• 期刊代码：18_03043843
• 类别：cp
• 卷：144
• 期：1
• 页码：65-76
• 数据来源：sp

摘要

Nuclear resonant inelastic X-ray scattering (NRIXS) of 14.4125 keV synchrotron radiation was used to measure directly the partial vibrational density of states (VDOS), g(E), of vapor-quenched amorphous Tb_1−x⁵⁷Fe_x thin film alloys (0.20⩽x⩽0.82). The structure of the samples was characterized by X-ray diffraction and Mössbauer spectroscopy. The behavior of the Lamb–Mössbauer factor obtained from measured vibrational excitation probability densities indicates vibrational softening with increasing Tb content. A plot of g(E)/E² versus E proves the existence of non-Debye-like vibrational excitations below about 10 meV, becoming more pronounced with rising Tb content.