The low temperature elastic anomalies in solid helium
Abstract
The elastic properties of hcp 4He samples have been shown to display various anomalies. The elastic shear modulus stiffens and the moment of rotational inertia drops when the temperature is lowered below 0.2 K. The relation between these two quantities is studied within the framework of classical deformable-body mechanics. A model based on the formation by plastic flow of extremely soft two-dimensional layers of dislocations is studied analytically and numerically. This model accounts quantitatively for a number of experiments. Other situations, in which it may seem less relevant, are discussed.
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