固体$^4$ He的粘弹性行为
Viscoelastic Behavior of Solid $^4$He
摘要：
在过去的五年里，几个实验组报告了含有固体$^4$ He的扭转振荡器的周期和振幅与温度的关系的异常。我们通过假设$^4$ He是一种粘弹性固体--一种具有与频率相关的内部摩擦的固体来模拟这些实验。我们发现，虽然我们的模型可以提供一个定量的帐户中观察到的耗散扭转振荡器的实验，它只占约10%的观察到的周期偏移，留下开放的可能性，剩余的周期偏移是由于超流性的样品中的发病。
英文摘要：
Over the last five years several experimental groups have reported anomalies in the temperature dependence of the period and amplitude of a torsional oscillator containing solid $^4$He. We model these experiments by assuming that $^4$He is a viscoelastic solid--a solid with frequency dependent internal friction. We find that while our model can provide a quantitative account of the dissipation observed in the torsional oscillator experiments, it only accounts for about 10% of the observed period shift, leaving open the possibility that the remaining period shift is due to the onset of superfluidity in the sample.
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