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29 March 2024
 
  » pubmed » pmid14754024

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Shear melting of a hexagonal columnar crystal by proliferation of dislocations
Laurence Ramos ; François Molino ;
Date 9 Jan 2004
Journal Phys Rev Lett, 92 (1), 018301
AbstractA hexagonal columnar crystal undergoes a shear-melting transition above a critical shear rate or stress. We combine the analysis of the shear-thinning regime below the melting with that of synchrotron x-ray scattering data under shear and propose the melting to be due to a proliferation of dislocations, whose density is determined by both techniques to vary as a power law of the shear rate with a 2/3 exponent, as expected for a creep model of crystalline solids. Moreover, our data suggest the existence under shear of a line hexatic phase, between the columnar crystal and the liquid phase.
Source PubMed, pmid14754024
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