Elastic properties of several amorphous solids and disordered crystals below 100 K
Elastic properties of several amorphous solids and disordered crystals below 100 K
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DOI：
10.1007/s002570050205
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发表时间：
1996-10-01
期刊：
影响因子：
--
通讯作者：
Cahill, DG
中科院分区：
文献类型：
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作者：
Topp, KA;Cahill, DG
我们已经测量了无定形CDCEES2，聚苯乙烯和造型2850ft环氧树脂以及无序晶体（ZRO2）（0.89）（0.89）（CAO）（0.11）和（0.11）和（CAF2），在60 mk和室温之间的声音变化的内部摩擦和速度。 （0.74）（LAF3）（0.26）。我们的结果与对先前发表的数据的广泛审查的比较表明，低于5 K的无序固体的内部摩擦具有显着的相似性。这些固体的低温弹性行为通过标准隧道模型充分描述找到玻璃的隧道状态的通用密度。但是，对于不同材料，内部摩擦类似于10 K的内部摩擦，显示出广泛的幅度和温度依赖性远非普遍。试图将低温下的内部摩擦观察到的隧道状态与高温下存在的局部振荡器的构型状态联系起来，必须考虑到10 K以上的无序固体之间的这种显着差异。
We have measured the internal friction and speed of sound variation at temperatures between 60 mK and room temperature for amorphous CdCeAs2, Polystyrene, and Stycast 2850FT epoxy, and the disordered crystals (ZrO2)(0.89)(CaO)(0.11) and (CaF2)(0.74)(LaF3)(0.26). A comparison of our results with an extensive review of previously published data shows a remarkable similarity in the internal friction of disordered solids below similar to 5 K. The low temperature elastic behavior of these solids is adequately described by the standard tunneling model, from which one finds a nearly universal density of tunneling states for glasses. Internal friction above similar to 10 K for different materials, however, displays a wide range of magnitudes and temperature dependence that is far from universal. Attempts to directly link the tunneling states observed by internal friction at low temperatures to configurational states of localized oscillators existing at high temperatures must take into account this striking variation among disordered solids above 10 K.