Special issue on the materials of the International Conference "Nanocarbon and Diamond" (NiA'2024)
Physical science of materials

Influence of phonon focusing effect on the diamond thermal conductivity

D. A. Chernodubov^ab, A. V. Inyushkin<sup>a

a</sup> National Research Centre "Kurchatov Institute", Moscow, Russia
^b Moscow Institute of Physics and Technology (National Research University), Dolgoprudny, Moscow oblast, Russia

Abstract: The thermal conductivity of diamond samples at low temperatures is calculated taking into account the phonon focusing effect based on the McCurdy, Maris and Elbaum theory in the frame of purely diffuse boundary scattering of phonons. Data on the focusing effect for transverse and longitudinal phonon modes are obtained. The calculated values of thermal conductivity are compared with experimental data for diamond samples in the form of square plates with different axes along [100] and [110]. At low temperatures near 5 K, experiment and theory showed satisfactory agreement, but above 10 K, anisotropy is not observed experimentally. Possible causes of this discrepancy are discussed.

Keywords: anisotropy, solid state, phonons, wide-bandgap semiconductors.

Received: 09.10.2024
Revised: 09.10.2024
Accepted: 09.10.2024

DOI: 10.61011/JTF.2025.02.59725.321-24

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