On peculiarities of excitation spectrum and anomalies of properties at moderate low temperatures in glasses |
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Authors: | M.I. Klinger |
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Affiliation: | A.F. Ioffe Physico-Technical Institute, 194021 Leningrad USSR |
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Abstract: | Spectrum of low-energy excitations in anharmonic atomic local potentials characteristic of glasses contains both tunneling states with energies and quasilocal vibrations with ??ω(?10?30K, w being a typical energy. A narrow peak of the spectrum density of states at is associated with a singularity corresponding to critical points of the spectrum. The vibrations can give rise to anomalies in thermal and other properties of glasses observed at moderate low T (1K < T ? w). Both these anomalies and the well-known anomalies at T <~ 1K can be described coherently in the frame of an unified approach. The theory also is able to predict some other anomalies in glasses, e.g. a peak of neutron inelastic scattering with ernergy transfer~ω. |
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