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Phonon anharmonicity of rutile SnO_2 studied by Raman spectrometry and first principles calculations of the kinematics of phonon-phonon interactions

机译:拉曼光谱和声子-声子相互作用运动学的第一性原理研究金红石型SnO_2的声子非调和

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摘要

Raman spectra of rutile tin dioxide (SnO_2) were measured at temperatures from 83 to 873 K. The pure anharmonicity from phonon-phonon interactions was found to be large and comparable to the quasiharmonicity. First-principles calculations of phonon dispersions were used to assess the kinematics of three-phonon and four-phonon processes. These kinematics were used to generate Raman peak widths and shifts, which were fit to measured data to obtain the cubic and quartic components of the anharmonicity for each Raman mode. The B_(2g) mode had a large quartic component, consistent with the symmetry of its atom displacements. The broadening of the B_(2g) mode with temperature showed an unusual concave-downwards curvature. This curvature is caused by a change with temperature in the number of down-conversion decay channels, originating with the wide band gap in the phonon dispersions.
机译:在83至873 K的温度下测量了金红石型二氧化锡(SnO_2)的拉曼光谱。发现声子-声子相互作用产生的纯非谐性很大,可与拟谐性相媲美。声子弥散的第一性原理计算用于评估三声子和四声子过程的运动学。这些运动学用于生成拉曼峰宽和频移,这些峰宽和频移适合于测量数据以获得每种拉曼模式的非谐性的立方和四次分量。 B_(2g)模式具有较大的四次分量,与其原子位移的对称性一致。 B_(2g)模随温度的展宽显示出异常的凹向下弯曲。该曲率是由于下转换衰减通道的数量随温度的变化而引起的,其源于声子色散的宽带隙。

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