FAST TWO-LEVEL SYSTEMS IN VITREOUS SILICA

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Abstract
A model containing an extra species of tunneling two-level systems, characterized by a lower threshold 0.3 K of the tunneling matrix element, a coupling constant 0.17 eV for interaction with longitudinal sound waves, and two more parameters for the shape of their distribution function, can account for the temperature dependences of fast specific heat, thermal conductivity, sound absorption and sound velocity in vitreous silica below 2 K. About 6.3 GHz, corresponding to the threshold 0.3 K, a sharp rise is predicted in the frequency dependence of low-temperature (resonant) sound absorption

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