%0 Journal Article
%T Shear-melting of a hexagonal columnar crystal by proliferation of dislocations
%+ Groupe de Dynamique des Phases Condensées (GDPC)
%A Ramos, L.
%A Molino, F.
%< avec comité de lecture
%@ 0031-9007
%J Physical Review Letters
%I American Physical Society
%V 92
%P 018301
%8 2004
%D 2004
%Z cond-mat/0407030
%R 10.1103/PhysRevLett.92.018301
%Z Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft]Journal articles
%X 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.
%G English
%L hal-00122194
%U https://hal.science/hal-00122194
%~ CNRS
%~ UNIV-MONTP2
%~ LCVN
%~ UNIV-MONTPELLIER
%~ UM1-UM2