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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 He-4. 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 He-4 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 He-4, our findings lend support to assumptions in the literature that inherently classical models remain useful for the description of mechanical behavior in quantum crystals.|
|Editor:||Amer Physical Soc|
|Appears in Collections:||Artigos e Materiais de Revistas Científicas - Unicamp|
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