Abstract
We calculate the dislocation glide mobility in solid \(^4\)He within a model that assumes the existence of a superfluid field associated with dislocation lines. Prompted by the results of this mobility calculation, we study within this model the role that such a superfluid field may play in the motion of the dislocation line when a stress is applied to the crystal. To do this, we relate the damping of dislocation motion, calculated in the presence of the assumed superfluid field, to the shear modulus of the crystal. As the temperature increases, we find that a sharp drop in the shear modulus will occur at the temperature where the superfluid field disappears. We compare the drop in shear modulus of the crystal arising from the temperature dependence of the damping contribution due to the superfluid field, to the experimental observation of the same phenomena in solid \(^4\)He and find quantitative agreement. Our results indicate that such a superfluid field plays an important role in dislocation pinning in a clean solid \(^4\)He at low temperatures and in this regime may provide an alternative source for the unusual elastic phenomena observed in solid \(^4\)He.
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Notes
We consider the limit whereby the effective mass per unit length as well as the effective tension per unit length of the dislocation line is negligible.
The acceleration time constant is given by the ratio of mass per unit length to the inverse mobility of the dislocation line. This time constant is very small \(\sim 10^{-13}\) s.
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Acknowledgments
This research was supported in part by IUSSTF Grant 94-2010.
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Malmi-Kakkada, A.N., Valls, O.T. & Dasgupta, C. Dislocation Mobility and Anomalous Shear Modulus Effect in \(^4\)He Crystals. J Low Temp Phys 186, 259–274 (2017). https://doi.org/10.1007/s10909-016-1689-3
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DOI: https://doi.org/10.1007/s10909-016-1689-3