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Updated: Jun 14, 2026

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
Published on: June 7, 2018
Dislocation mobility in a quantum crystal: the case of solid 4He
Renato Pessoa1, S A Vitiello, Maurice de Koning
1Instituto de Física Gleb Wataghin, Caixa Postal 6165, Universidade Estadual de Campinas - UNICAMP 13083-970, Campinas, SP, Brazil. rpessoa@ifi.unicamp.br
Abstract:
We investigate the structure and mobility of dislocations in hcp 4He crystals. In addition to fully characterizing the five elastic constants of this system, we obtain direct insight into dislocation core structures on the basal plane, which demonstrates a tendency toward dissociation into partial dislocations. Moreover, our results suggest that intrinsic lattice resistance is an essential factor in the mobility of these dislocations. This insight sheds new light on the possible correlation between dislocation mobility and the observed macroscopic behavior of crystalline 4He.
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