%0 Journal Article
%T Defect dynamics in a smectic Grandjean-Cano wedge.
%+ Groupe de Dynamique des Phases Condensées (GDPC)
%+ Institut de minéralogie et de physique des milieux condensés (IMPMC)
%+ IPMC
%+ Laboratoire de Physique de la Matière Condensée - UR UPJV 2081 (LPMC)
%A Blanc, Christophe
%A Zuodar, Nadia
%A Lelidis, Ioannis
%A Kleman, Maurice
%A Martin, Jean-Luc
%< avec comité de lecture
%@ 1539-3755
%J Physical Review E : Statistical, Nonlinear, and Soft Matter Physics
%I American Physical Society
%V 69
%P 011705
%8 2004
%D 2004
%R 10.1103/PhysRevE.69.011705
%K smectic liquid crystals
%K liquid crystal phase transformations
%K compressibility
%K deformation
%K screw dislocations
%K edge dislocations
%K dislocation loops
%K nucleation
%Z PACS: 61.30.Jf, 46.35.+z, 61.72.Ff, 61.72.LkJournal articles
%X An array of edge dislocation forms spontaneously in a Grandjean-Cano wedge filled by a smectic liquid crystal. In the vicinity of the smectic A to smectic C transition, these defects are visible under the microscope [R. B. Meyer, B. Stebler, and S. T. Lagerwall, Phys. Rev. Lett. 41, 1393 (1978)]. This paper deals with their dynamics under controlled deformation (dilation and compression). First, we characterize several regimes of dislocation mobility occurring with increasing strain epsilon or strain rate epsilon. We relate these regimes to the interactions between screw and edge dislocations. We also show that screw dislocations give rise to loops of edge dislocations under sufficient strain, which strengthens the model of loop nucleation by helical instability of screw dislocations. Lastly, we discuss several models for the microscopic origin of the interactions between defects.
%G English
%L hal-00085972
%U https://hal.science/hal-00085972
%~ UNIV-PARIS7
%~ UPMC
%~ CNRS
%~ UNIV-PICARDIE
%~ UNIV-MONTP2
%~ IMPMC
%~ ALLINSP
%~ LCVN
%~ UPMC_POLE_2
%~ UNIV-MONTPELLIER
%~ SORBONNE-UNIVERSITE
%~ SU-SCIENCES
%~ UNIV-PARIS
%~ U-PICARDIE
%~ LPMC-UPJV
%~ ALLIANCE-SU
%~ UM1-UM2