Abstract
The influence of two-level tunnelling systems and bosonic peak on the second-order Doppler displacement of Mossbauer γ-radiation in disordered materials is investigated. It is shown, that the Mossbauer frequency temperature displacement at temperatures 10 -4 K < T < ω m ∞/k B is determined by bosonic peak and at T < 10 -4 K by two-level tunnelling systems.
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