Characteristic features of the low-temperature thermal conductivity of highly-enriched and natural germanium |
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Authors: | A P Zhernov D A Zhernov |
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Institution: | (1) Russian Science Center “Kurchatov Institute”, 123182 Moscow, Russia;(2) Institute of Superconductivity and Solid-State Physics, Moscow, Russia |
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Abstract: | Experimental data on the thermal conductivity K(T) of natural and highly enriched (99.99%) Ge70 crystals with ground and polished surfaces are analyzed in the temperature interval ∼2–8 K. In all samples, the boundary
scattering mechanism predominates in the interval from 2 to 4.0 K. As temperature increases, in highly enriched samples N processes start to contribute to phonon transport and the behavior of K(T) corresponds to viscous Poiseuille flow of a phonon gas. The isotopic scattering mechanism plays a large role in isotopically
nonideal samples.
Fiz. Tverd. Tela (St. Petersburg) 40, 1604–1607 (September 1998) |
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