The lattice dynamics of antimony
The lattice dynamics of antimony
复制标题
锑的晶格动力学
DOI：
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发表时间：
1971
期刊：
影响因子：
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通讯作者：
E. Warming
中科院分区：
文献类型：
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作者：
R. Sharp;E. Warming
本文报道了锑在室温下振型频率的非弹性中子散射测量。给出了在倒易晶格和倒易晶格方向上具有简化波的声子的频率，并在其中一个镜像平面上极化。将一般张量力扩展到每个原子的第9近邻的Bornvon Karman模型无法将数据拟合到测量精度范围内。用离子等离子体频率标度所有频率，与铋声子色散曲线进行了比较。在小波向的尺度色散曲线之间的显著差异归因于自旋-轨道耦合对介电常数的波向依赖性的影响。在区域边界，声子频率对筛选的细节不太敏感，但如果声子频率的计算与实验一致，则包括共价的影响似乎很重要。
Inelastic neutron scattering measurements are reported of the frequencies of the normal modes of vibration of antimony at room temperature. Results are presented for the frequencies of phonons with reduced wavevectors in the , and directions of the reciprocal lattice, and polarized in one of the mirror planes. Bornvon Karman models with general tensor forces extending to the ninth-nearest neighbours of each atom are unable to fit the data to within the accuracy of the measurements. Comparisons are made with phonon dispersion curves for bismuth by scaling all frequencies with the ionic plasma frequency. Marked differences between the scaled dispersion curves at small wavevectors are attributed to the effects of spin-orbit coupling on the wavevector dependence of the dielectric constant. At the zone boundaries, the phonon frequencies are less sensitive to details of the screening, but it seems important to include the effects of covalency if calculations of the phonon frequencies are to agree with experiment.