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Shear-melting of a hexagonal columnar crystal by proliferation of dislocations 
Auteur(s): Ramos L., Molino F.
(Article) Publié:
Physical Review Letters, vol. 92 p.018301 (2004)
Texte intégral en Openaccess : 
Ref HAL: hal-00122194_v1
PMID 14754024
Ref Arxiv: cond-mat/0407030
DOI: 10.1103/PhysRevLett.92.018301
WoS: 000187968500050
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
16 Citations
Résumé: A 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.
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