Journal of Low Temperature Physics

, Volume 162, Issue 5–6, pp 464–475 | Cite as

Glide and Superclimb of Dislocations in Solid 4He

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Abstract

Glide and superclimb—climb assisted by superfluidity along dislocation core—of quantum dislocations are studied by Monte Carlo simulations of the effective string model subjected to Peierls potential, tilting and external force. Close to critical stresses, corresponding to creation of kink-antikink pairs, gliding non-tilted dislocation exhibits resonant roughening. At finite tilts gliding dislocation remains quantum rough which leads to effective softening of dislocation tension and, consequently, to softening of shear modulus at low temperatures (T). This effect is interpreted as (quasi) Bose-Einstein condensation of extra kinks introduced by tilting. For superclimbing dislocation, at T where the core superfluidity still persists and Peierls barrier becomes irrelevant giant values of the compressibility as well as non-Luttinger type behavior of the core superfluid are observed. Crossover to standard Luttinger liquid occurs at low T where Peierls potential becomes relevant. Tilted superclimb is discussed as well.

Keywords

Supersolid Quantum dislocations Roughening Glide Superclimb 
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Copyright information

© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  1. 1.Department of Physics and EngineeringCollege of Staten Island, CUNYStaten IslandUSA

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