CCES Unicamp

Absence of Off-Diagonal Long-Range Order in hcp 4-He Dislocation Cores

The mass transport properties along dislocation cores in hcp 4-He are revisited by considering two types of edge dislocations as well as a screw dislocation, using a fully correlated quantum simulation approach. Specifically, we employ the zero-temperature path-integral ground state (PIGS) method together with ergodic sampling of the permutation space to investigate the fundamental dislocation core structures and their off-diagonal long-range order properties. It is found that the Bose-Einstein condensate fraction of such defective 4-He systems is practically null (≤10−6), just as in the bulk defect-free crystal. These results provide compelling evidence for the absence of intrinsic superfluidity in dislocation cores in hcp 4He and challenge the superfluid dislocation-network interpretation of the mass-flux-experiment observations, calling for further experimental investigation.
Phys. Rev. Lett. 130, 016001 (2023)




Related posts

dCCIforLAMMPS: dynamical Clausius-Clapeyron integration using LAMMPS

cces cces

Claudia Bauzer Medeiros elected for the Brazilian Academy of Sciences

cces cces

Converting scripts into reproducible Workflow Research Objects

WP Twitter Auto Publish Powered By :