The role of Helium-3 impurities in the stress induced roughening of superclimbing dislocations in solid Helium-4

Details The role of Helium-3 impurities in the stress induced roughening of superclimbing dislocations in solid Helium-4 The role of Helium-3 impurities in the stress induced roughening of superclimbing dislocations in solid Helium-4

2011-08-04

arxiv.org/abs/1108.1182v1

Physics

Condensed Matter

Other Condensed Matter

Submitted to the LT26-conference proceedings

Scientific paper

We analyze the stress induced and thermally assisted roughening of a forest of superclimbing dislocations in a Peierls potential in the presence of Helium-3 impurities and randomly frozen in static stresses. It is shown that the temperature of the dip $T_d$ in the flow rate observed by Ray and Hallock (Phys.Rev. Lett. {\bf 105}, 145301 (2010)) is determined by the energy of the impurity activation from dislocation core. However, it is suppressed by, essentially, the logarithm of the impurity fraction. The width of the dip is determined by inhomogeneous fluctuations of the stresses and is shown to be much smaller than $T_d$.

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