Glide and Superclimb of Dislocations in Solid $^4$He

Details Glide and Superclimb of Dislocations in Solid $^4$He Glide and Superclimb of Dislocations in Solid $^4$He

2010-06-27

arxiv.org/abs/1006.5228v1

Physics

Condensed Matter

Other Condensed Matter

Updated version submitted to JLTP as QFS2010 proceedings; 11 pages, 6 figures

Scientific paper

Glide and climb of quantum dislocations under finite external stress, variation of chemical potential and bias (geometrical slanting) in Peierls potential are studied by Monte Carlo simulations of the effective string model. We treat on unified ground quantum effects at finite temperatures $T$. Climb at low $T$ is assisted by superflow along dislocation core -- {\it superclimb}. Above some critical stress avalanche-type creation of kinks is found. It is characterized by hysteretic behavior at low $T$. At finite biases gliding dislocation remains rough even at lowest $T$ -- the behavior opposite to non-slanted dislocations. In contrast to glide, superclimb is characterized by quantum smooth state at low temperatures even for finite bias. In some intermediate $T$-range giant values of the compressibility as well as non-Luttinger type behavior of the core superfluid are observed.

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