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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >On the analysis of the vibrational Boson peak and low-energy excitations in glasses
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On the analysis of the vibrational Boson peak and low-energy excitations in glasses

机译：眼镜的玻色子振动峰和低能激发的分析

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摘要

Implications of reduction procedures applied to the low energy part of the vibrational density of states in glasses and supercooled liquids are considered by advancing a detailed comparison between the excess - over the Debye limit - vibrational density of states g(omega) and the frequency-reduced representation g(omega)/omega(2) usually referred to as the Boson peak. Analyzing representative experimental data from inelastic neutron and Raman scattering, we show that reduction procedures distort to a great extent the otherwise symmetric excess density of states. The frequency of the maximum and the intensity of the excess experience dramatic changes; the former is reduced while the latter increases. The frequency and the intensity of the Boson peak are also sensitive to the distribution of the excess. In the light of the critical appraisal between the two forms of the density of states (i.e. the excess and the frequency-reduced one) we discuss changes of the Boson peak spectral features that are induced under the presence of external stimuli such as temperature (quenching rate, annealing), pressure, and irradiation. The majority of the Boson peak changes induced by the presence of those stimuli can be reasonably traced back to simple and expected modifications of the excess density of states and can be quite satisfactorily accounted for by the Euclidean random matrix theory. Parallels to the heat capacity 'Boson peak' are also briefly discussed. (c) 2006 Elsevier B.V. All rights reserved.
机译：通过推进超过德拜极限的状态振动密度g（ω）与降低的频率之间的详细比较，可以考虑将还原程序应用于玻璃和过冷液体中状态的振动密度的低能部分g（ω）/ omega（2）表示形式，通常称为玻色子峰。分析来自非弹性中子和拉曼散射的代表性实验数据，我们表明还原过程在很大程度上扭曲了否则对称的过剩状态密度。最大值的频率和过量的强度发生巨大变化;前者减少而后者增加。玻色子峰的频率和强度对过量的分布也很敏感。根据状态密度的两种形式（即过剩状态和降低频率的状态）之间的严格评估，我们讨论了在外部刺激（例如淬火）的存在下引起的玻色子峰光谱特征的变化。速率，退火），压力和辐射。由这些刺激的存在引起的大多数玻色子峰变化可以合理地追溯到状态过剩密度的简单和预期的变化，并且可以由欧几里得随机矩阵理论令人满意地解释。还简要讨论了与热容“玻色子峰”平行的情况。 （c）2006 Elsevier B.V.保留所有权利。

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