Article Dans Une Revue Physical Review Letters Année : 2004

Shear-melting of a hexagonal columnar crystal by proliferation of dislocations

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.

Dates et versions

hal-00122194 , version 1 (28-12-2006)

Identifiants

Citer

L. Ramos, F. Molino. Shear-melting of a hexagonal columnar crystal by proliferation of dislocations. Physical Review Letters, 2004, 92, pp.018301. ⟨10.1103/PhysRevLett.92.018301⟩. ⟨hal-00122194⟩
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