Abstract
The results of studies of the transport of thermal frequency phonons in amorphous dielectrics (glasses and glass-like materials) are presented. It is shown that the formation of a plateau region in the temperature dependence of thermal conductivity at T < 10 K can be associated with the appearance of a “gap” in the spectrum of phonon states. The features of the transport characteristics of phonons in single crystals of solid solutions of aluminum-rare-earth garnets (ARGs) are analyzed in the helium temperature range in the presence of low-energy excitations of a paramagnetic nature. It is shown that under the conditions of a non-stationary process of propagation of a thermal pulse at a given thermostat temperature, it is possible to establish equilibrium in the system of nonequilibrium phonons-two-level systems (TLSs) in a sample of a certain length. It has been found that the efficiency of interaction of phonons with TLSs and their transport depend on the type, magnetic moment of the rare-earth ion, energy, and spectral features in the ARG lattice.
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The study was carried out within a state task of the Kotelnikov Institute of Radioengineering and Electronics, Russian Academy of Sciences.
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Salamatov, E.I., Taranov, A.V. & Khasanov, E.N. Phonon Spectroscopy of Low-Energy Excitations in Solid Solutions of Dielectrics in the Helium Temperature Region. J. Commun. Technol. Electron. 67, 593–602 (2022). https://doi.org/10.1134/S1064226922060183
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DOI: https://doi.org/10.1134/S1064226922060183