Influence of isotope scattering on the thermal conductivity of diamond

被引：46

作者：

Sparavigna, A

机构：

[1] Politecn Torino, Dipartimento Fis, I-10129 Turin, Italy

[2] Politecn Torino, Ist Nazl Fis Mat, I-10129 Turin, Italy

来源：

PHYSICAL REVIEW B | 2002年 / 65卷 / 06期

关键词：

D O I：

10.1103/PhysRevB.65.064305

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The thermal conductivity of diamond crystals with different isotope contents is evaluated in the framework of a microscopic model that considers acoustic- and optical-phonon branches. The phonon Boltzmann equation is solved iteratively, with the phonon wave vectors taken in the real Brillouin zone and the three-phonon normal and umklapp collisions, with the isotope scattering, rigorously treated. As a consequence, the evaluation of the thermal conductivity is done avoiding the relaxation-time approximation for the scattering mechanisms. Good agreement with the experimental data is obtained. The calculation reveals a fundamental role of the optical phonons in determining the thermal resistivity of diamond. Comparison of the theoretical results with the recent experimental data for germanium and silicon is also proposed.

引用

页码：1 / 5

页数：5

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