Fizika Nizkikh Temperatur: Volume 27, Number 9-10 (September 2001), p. 1159-1169    ( to contents , go back )

Search for the minimum thermal conductivity in mixed cryocrystals (CH4)1-x Krx

V. A. Konstantinov , V. G. Manzhelii, and V. P. Revyakin

B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Lenin ave., Kharkov, 63103, Ukraine

R. O. Pohl

Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, New York, USA
pos Анотація:

Received March 21, 2001


The isochoric thermal conductivity of (CH4)1-x Krx solid solutions is studied between 40 K and ~ 150 K over the wide range of concentrations (x = 0.013, 0.032, 0.07, 0.115, 0.34, 0.71, 0.855, 0.937, and 0.97). A gradual transition from the thermal conductivity of a highly perfect crystal to the minimum thermal conductivity is observed as the crystal becomes increasingly more disordered. A qualitative description is given in the framework of Debye model of thermal conductivity, which takes into consideration the fact that phonon mean free path cannot decrease indefinitely.

66.70.+f - Nonelectronic thermal conduction and heat-pulse propagation in solids; thermal waves (for thermal conduction in metals and alloys, see 72.15.Cz and 72.15.Eb)
63.20.Ls - Phonon interactions with other quasiparticles
63.20.Hp -
Download 290695 byte Download 850815 byte View Contents