Glass anomaly in the shear modulus of solid 4He.
Glass anomaly in the shear modulus of solid 4He.
复制标题
固体 4He 剪切模量的玻璃异常。
DOI：
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发表时间：
2010
影响因子：
8.6
通讯作者：
A. Balatsky
中科院分区：
文献类型：
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作者：
Jung;M. Graf;A. Balatsky
固体H {4} e的剪切模量在低温下表现出异常增加，其行为定性地类似于扭转振荡器实验中的频率变化。我们提出，这种随温度降低的剪切模量的硬化可以用玻璃敏感性来描述，假设温度依赖的弛豫时间τ（T）。在特征交叉温度T {X}以下，其中ω τ（T {X}）<1，动力学的显著减慢导致剪切模量的增加。我们预测，剪切模量的振幅的最大变化和耗散峰的高度与所施加的频率ω无关。我们的计算还显示了取决于τ（T）的温度依赖性的剪切模量的行为的定性差异。
The shear modulus of solid H{4}e exhibits an anomalous increase at low temperatures that behaves qualitatively similar to the frequency change in torsional oscillator experiments. We propose that this stiffening of the shear modulus with decreasing temperature can be described with a glass susceptibility assuming a temperature-dependent relaxation time τ(T). Below a characteristic crossover temperature T{X}, where ωτ(T{X})∼1, a significant slowing down of dynamics leads to an increase in the shear modulus. We predict that the maximum change of the amplitude of the shear modulus and the height of the dissipation peak are independent of the applied frequency ω. Our calculations also show a qualitative difference in behavior of the shear modulus depending on the temperature dependence of τ(T).