Classical mobility of highly mobile crystal defects

Classical mobility of highly mobile crystal defects

Highly mobile crystal defects such as crowdions and prismatic dislocation loops exhibit an anomalous temperature independent mobility unexplained by phonon scattering analysis. Using a projection operator, without recourse to elasticity, we derive analytic expressions for the mobility of highly mobi...

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Bibliographic Details
Published in:Physical review letters Vol. 113; no. 21; p. 215501
Main Authors: Swinburne, T D, Dudarev, S L, Sutton, A P
Format: Journal Article
Language:English
Published: United States American Physical Society 21-11-2014
Subjects:
Condensed Matter
Crystal defects
Dislocation loops
Dislocation mobility
Exact solutions
Materials Science
Mathematical analysis
Molecular dynamics
Physics
Projection
Simulation
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Description
Summary:Highly mobile crystal defects such as crowdions and prismatic dislocation loops exhibit an anomalous temperature independent mobility unexplained by phonon scattering analysis. Using a projection operator, without recourse to elasticity, we derive analytic expressions for the mobility of highly mobile defects and dislocations which may be efficiently evaluated in molecular dynamics simulation. The theory explains how a temperature-independent mobility arises because defect motion is not an eigenmode of the Hessian, an implicit assumption in all previous treatments.
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ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.113.215501