Tunnel modes and kinetic properties of glasses at low and high temperatures

V. N. Fleurov, L. I. Trakhtenberg

Research output: Contribution to journalArticlepeer-review


A theoretical approach is presented intending to unify tunnel mode and structural defect concepts existing in the theory of amorphous solids. Origins of double-well potentials (dwp) are discussed and two types of dwps—soft and rigid—are emphasised. Soft dwps are mainly responsible for low-temperature properties whereas rigid dwps determine the properties of glasses at higher temperatures. Tunnelling in rigid dwps is largely influenced by the barrier fluctuative preparation, the multi-phonon processes are of importance at higher temperatures. The dwp relaxation time up to room temperature is analysed. The sound attenuation due to the relaxation and multi-phonon mechanisms is calculated and their relative contributions are compared. The role of these processes in the thermal conductivity and temperature plateau formation is discussed.

Original languageEnglish
Pages (from-to)5529-5553
Number of pages25
JournalJournal of Physics C: Solid State Physics
Issue number28
StatePublished - 10 Oct 1986
Externally publishedYes


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