Saturation of the 9.4-GHz Hypersonic Attenuation in Fast-Neutron-Irradiated Crystalline Quartz

作者：Christiane Laermans · 发表于：Physical Review Letters · 年份：1979 · DOI：10.1103/physrevlett.42.250 · 被引用次数：64 · 研究领域：NMR spectroscopy and applications、Advanced NMR Techniques and Applications、Solid-state spectroscopy and crystallography

Saturation of the 9.4-GHz hypersonic attenuation was observed in crystalline quartz after fast-neutron irradiation. The sample, which exhibits long-range order, shows a low-temperature acoustic behavior similar to that observed in amorphous materials. As in glasses, the results can be explained by the existence of configurational low-energy excitations, with a two-state nature, which were put forward as intrinsic to the amorphous state.