Mechanical and superfluid properties of dislocations in solid He4

Details Mechanical and superfluid properties of dislocations in solid He4 Mechanical and superfluid properties of dislocations in solid He4

2008-12-04

arxiv.org/abs/0812.0983v1

Physics

Condensed Matter

Statistical Mechanics

4 pages with 2 figures

Scientific paper

Dislocations are shown to be smooth at zero temperature because of the effective Coulomb-type interaction between kinks. Crossover to finite temperature rougnehing is suggested to be a mechanism responsible for the softening of \he4 shear modulus recently observed by Day and Beamish (Nature, {\bf 450}, 853 (2007)). We discuss also that strong suppresion of superfuidity along the dislocation core by thermal kinks can lead to locking in of the mechanical and superfluid responses.

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