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Abstract: We suggest that below a certain temperature T k, the free energy for thecreation of kinks-antikinks pairs in the dislocation network of solid He4becomes negative. The underlying physical mechanism is the related liberationof vacancies which initiate Feynman-s permutation cycles in the bulk.Consequently, dislocations should wander and sweep an increasingly largervolume at low temperatures. This phenomenon should lead both to a stiffening ofthe solid below T k and to the appearance of a non zero superfluid fraction ata second temperature T c < T k.



Author: Jean-Philippe Bouchaud, Giulio Biroli

Source: https://arxiv.org/







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