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|Type:||Artigo de periódico|
|Title:||Ideal Shear Strength Of A Quantum Crystal|
De Koning M.
|Abstract:||Using path-integral Monte Carlo simulations, we compute the ideal shear strength (ISS) on the basal plane of hcp He4. The failure mode upon reaching the ISS limit is characterized by the homogeneous nucleation of a stacking fault and it is found to be anisotropic, consistent with Schmid's law of resolved shear stress. Comparing the ISS of hcp He4 to a large set of classical crystals shows that it closely fits the approximately universal modified Frenkel model of ideal strength. In addition to giving quantitative stress levels for the homogeneous nucleation of extended defects in hcp He4, our findings lend support to assumptions in the literature that inherently classical models remain useful for the description of mechanical behavior in quantum crystals. © 2014 American Physical Society.|
|Editor:||American Physical Society|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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