Dislocation Structure and Mobility in hcp He4

Landinez Borda, Edgar Josue; Cai, Wei; de Koning, Maurice

doi:10.1103/PhysRevLett.117.045301

Title: Dislocation Structure and Mobility in hcp ${}^{4}{He}$

Journal Article · Wed Jul 20 00:00:00 EDT 2016 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.117.045301· OSTI ID:1326881

Landinez Borda, Edgar Josue ^[1]; Cai, Wei ^[2]; de Koning, Maurice ^[3]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Stanford Univ., CA (United States). Dept. of Mechanical Engineering
Univ. of Campinas (UNICAMP), Sao Paulo (Brazil). Inst. of Physics

We assess the core structure and mobility of the screw and edge basal-plane dislocations in hcp ⁴He using path-integral Monte Carlo simulations. Our findings provide key insights into recent interpretations of giant plasticity and mass flow junction experiments. First, both dislocations are dissociated into nonsuperfluid Shockley partial dislocations separated by ribbons of stacking fault, suggesting that they are unlikely to act as one-dimensional channels that may display Lüttinger-liquid-like behavior. Second, the centroid positions of the partial cores are found to fluctuate substantially, even in the absence of applied shear stresses. This implies that the lattice resistance to motion of the partial dislocations is negligible, consistent with the recent experimental observations of giant plasticity. Our results indicate that both the structure of the partial cores and the zero-point fluctuations play a role in this extreme mobility.

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Research Organization:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-07NA27344; SC0010412; 2013/08293-7

OSTI ID:: 1326881

Alternate ID(s):: OSTI ID: 1266406

Report Number(s):: LLNL-JRNL-691477; PRLTAO

Journal Information:: Physical Review Letters, Vol. 117, Issue 4; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 16 works

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