Temperature Dependence of the Long-Wavelength Optical Phonons in Diamond
Temperature Dependence of the Long-Wavelength Optical Phonons in Diamond
复制标题
金刚石中长波长光学声子的温度依赖性
DOI：
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发表时间：
1971
期刊：
影响因子：
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通讯作者：
C. H. Perry
中科院分区：
文献类型：
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作者：
E. Anastassakis;H. Hwang;C. H. Perry
我们研究了温度在10- 1000 μ m模式范围内的影响 extdegreefi{}K对$stackrel{ensuremath{
利用喇曼散射技术测量了金刚石中的光学声子。并将所得结果与其他工作者的实验和理论结果作了比较。随着温度的升高，谱线的加宽由通道数量的增加决定，通过通道，模式衰减成成对的声学模式。超过850 ifmmode ^circelse extdegreefi{}K时，晶体表现出高阶非谐性。它还建立了频率偏移主要是由于热膨胀，散射发生的条件下的声子人口平衡。
We investigate the effects of temperature in the range 10-1000ifmmode^circelse extdegreefi{}K on the frequency and line-width of the $stackrel{ensuremath{
ightarrow}}{mathrm{q}}ensuremath{simeq}0$ optical phonons in diamond, using Raman-scattering techniques. Comparison is made between the present results and those obtained experimentally and theoretically by other workers. As the temperature increases, the broadening of the line is determined by an increasing number of channels through which the mode decays into pairs of acoustical modes. Beyond 850ifmmode^circelse extdegreefi{}K it is found that the crystal exhibits higher-order anharmonicity. It is also established that the frequency shift is largely due to thermal expansion, and that the scattering occurs under conditions of phonon-population equilibrium.