Properties unique to disordered materials have been observed through electron paramagnetic resonance studies of a prototype glass. The electron-spin-relaxation rate of an irradiation-induced color center was measured in K, Li, and Na β-alumina, and revealed expectionally fast relaxation with anomalous temperature and microwave frequency dependence. This behavior is quantitatively described by a mechanism involving the coupling of a color center to the phonon-induced relaxation of a nearby localized two-level tunneling state. A detailed comparison shows that our model is in agreement with earlier heat-capacity, thermal-conductivity, and dielectric-susceptibility measurements in β-alumina.
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Kurtz et al. (1980) studied this question.
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