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

Abstract

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.

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

References in corpus (5)

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• Luttinger Liquid in the Core of Screw Dislocation in Helium-4
• The fate of vacancy-induced supersolidity in 4He
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Cited by in corpus (9)

• Simulation and understanding of quantum crystals
• Quantum Plasticity and Supersolid Response in Helium-4
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• Stress induced dislocation roughening -- phase transition in 1d at finite temperature
• The low temperature elastic anomalies in solid helium
• Dislocation Mobility and Anomalous Shear Modulus Effect in ${}^4$He Crystals
• Superfluid Field response to Edge dislocation motion
• The role of Helium-3 impurities in the stress induced roughening of superclimbing dislocations in solid Helium-4
• Quantized vortex state in hcp solid 4He