Физика Низких Температур: Том 27, Выпуск 9-10 (Сентябрь 2001), c. 1159-1169    ( к оглавлению , назад )

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
E-mail: konstantinov@ilt.kharkov.ua

R. O. Pohl

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

Received March 21, 2001

Аннотация

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.

PACS:
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 -