1303.1852 (Caizhi Zhou et al.)

Plastic response of dislocation glide in solid helium under dc strain
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Caizhi Zhou, Jung-Jung Su, Matthias J. Graf, Charles Reichhardt, Alexander V. Balatsky, Irene J. Beyerlein

In this work we develop a model for the gliding of dislocations and plasticity in solid Helium-4. This model takes into account dislocation multiplication, Peierls barrier, and dislocation interactions. We specifically examine stress-strain curves and temperature effects. As a function of temperature, we observe plastic deformation and discuss how this may be related to the experimental observation of elastic anomalies in solid hcp Helium-4 that have been discussed in connection with the possibility of supersolidity. Our model predictions can be compared directly to constant strain rate experiments and provide bounds on model parameters.

View original: http://arxiv.org/abs/1303.1852