固态氦中的非线性弹性响应：临界速度或应变
Non-linear Elastic Response in Solid Helium: critical velocity or strain
摘要：
扭振实验表明固体4He中存在质量解耦现象。这种退耦是振幅依赖的，表明超固体存在临界速度。我们在弹性剪切模量中观察到类似的行为。通过在宽频率范围内测量剪切模量，我们可以区分依赖于速度的振幅依赖性和依赖于位移等其他参数的振幅依赖性。与扭转振子行为相反，模量取决于应力的大小，而不是速度。我们解释我们的结果中的运动的位错是弱钉扎的3He杂质，但大的应力时，脱离。
英文摘要：
Torsional oscillator experiments show evidence of mass decoupling in solid 4He. This decoupling is amplitude dependent, suggesting a critical velocity for supersolidity. We observe similar behavior in the elastic shear modulus. By measuring the shear modulus over a wide frequency range, we can distinguish between an amplitude dependence which depends on velocity and one which depends on some other parameter like displacement. In contrast to the torsional oscillator behavior, the modulus depends on the magnitude of stress, not velocity. We interpret our results in terms of the motion of dislocations which are weakly pinned by 3He impurities but which break away when large stresses are applied.
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