Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2011-07-12
Physics
Condensed Matter
Other Condensed Matter
Preliminary draft with 9 pages with RevTeX 4-1 two-column processing and 4 figures in eps format. The author is thankful in ad
Scientific paper
The elastic properties of hcp $^4$He 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 $\sim$ 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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