Volume 126, Number 1, April 2019
|Number of page(s)||6|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||20 May 2019|
Extruding the vortex lattice: Two reacting populations of dislocations
School of Physics and Astronomy, University of Birmingham - Birmingham, B15 2TT, UK
Received: 13 February 2019
Accepted: 1 April 2019
A controllable soft solid is realised in vortex matter (Eskildsen M. R. et al., Rep. Prog. Phys., 74 (2011) 124504; Guillamon I. et al., Nat. Phys., 10 (2014) 851; Lukyanchuk I. et al., Nat. Phys., 11 (2015) 21) in a type-II superconductor. The two-dimensional unit cell area can be varied (Fasano Y. and Menghini M., Supercond. Sci. Technol., 21 (2008) 023001) by a factor of 104 in the solid phase, without a change of crystal symmetry offering easy exploration of extreme regimes compared to ordinary materials. The capacity to confine two-dimensional vortex matter to mesoscopic regions (see paper by Lukyanchuk et al. again and Kes P. H. et al., Phys. C: Supercond., 408 (2004) 478) provides an arena for the largely unexplored metallurgy of plastic deformation at large density gradients. Our simulations reveal a novel plastic flow mechanism in this driven non-equilibrium system, utilising two distinct, but strongly interacting, populations of dislocations. One population facilitates the relaxation of density; a second aids the relaxation of shear stresses concentrated at the boundaries. The disparity of the bulk and shear moduli in vortex matter ensures the dislocation motion follows the overall continuum flow reflecting density variation.
PACS: 61.72.Lk – Linear defects: dislocations, disclinations / 74.25.Uv – Vortex phases (includes vortex lattices, vortex liquids, and vortex glasses) / 45.70.Vn – Granular models of complex systems; traffic flow
© EPLA, 2019
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