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Reversible plasticity, reentrant transitions and heat transport in confined solid strips

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Abstract Book of the XXIII IUPAP International Conference on Statistical Physics, Genova, Italy, (9-13 July 2007)

Abstract

Using computer simulations and mean field calculations, we investigate mechanical properties, the possible phases and the heat conductance of a narrow strip of solid confined in a quasi one dimensional channel. Under external strain, the stress initially grows linearly but rapidly enters a non-linear regime followed by plastic deformation and failure through the nucleation of co-existing ``smectic'' regions within the solid. Surprisingly, as the strain is reversed, the material recovers completely and returns to its original undeformed state. When placed in a temperature gradient during the deformation process, the changes in the internal structure accompanying strain induced failure of the solid leads to sharp changes in the heat current. The phase and mechanical behavior depends crucially on the commensurability of the mean interparticle spacing (or density) with the channel width. Fixing the density, a change in channel width leads to many reentrant transitions. In the thermodynamic limit of an infinitely long, narrow strip, fluctuations destroy solid like translational order. Reference:\\ 1) D. Chaudhuri and S. Sengupta, Phys. Rev. Lett. 93, 115702 (2004).\\ 2) D. Chaudhuri and A. Dhar, Phys. Rev. E 74, 016114 (2006).

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