Abstract
At low temperatures amorphous solids exhibit dynamical properties which are quite different from those of their crystalline counterparts[1]. They can be attributed to the existence of two-level systems (TLS) [2], and can formally be described by the tunnelling model [3]. Similar anomalies as in amorphous solids were observed in neutron-irradiated quartz [4–8]. They were explained by the presence of TLS similar to those in vitreous silica, but with a density of states which is smaller than in vitreous silica and which increases with neutron dose. The microscopic origin of the TLS is however not known yet [1].
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