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.
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Aleinikava, D., Dedits, E. & Kuklov, A.B. Glide and Superclimb of Dislocations in Solid 4He. J Low Temp Phys 162, 464–475 (2011). https://doi.org/10.1007/s10909-010-0288-y
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DOI: https://doi.org/10.1007/s10909-010-0288-y