Heat transfer by mobile low-frequency phonons and "localized" modes in cryocrystal solutions

• Main Authors: Konstantinov, V. A, Orel, E. S, Revyakin, V. P
• Format: Journal Article
• Language: English
• Published: 02.01.2003
• Subjects: Physics - Disordered Systems and Neural Networks; Physics - Materials Science
• DOI: 10.48550/arxiv.cond-mat/0301011

The temperature and volume dependences of the thermal conductivity of solid Kr(1-x)Xe(x)solution are analyzed within the model in which heat is transferred by mobile low-frequency phonons; above the phonon mobility edge this is done by "localized" modes migrating randomly from site to site. The phonon mobility edge (w0)is determined from the condition that the phonon mean -free path restricted by Umklapp processes and point defects scattering cannot be smaller than one-half the phonon wavelength. The Bridgman coefficient is the weighted - mean over these modes whose volume dependences differ widely. It is shown that the amount of heat transferred by the "localized" modes above 100 K is quite large even in pure Kr and it increases with rising temperature and impurity concentration.