Softening and melting of a vortex lattice in presence of point disorder

Details Softening and melting of a vortex lattice in presence of point disorder Softening and melting of a vortex lattice in presence of point disorder

1998-05-07

arxiv.org/abs/cond-mat/9805080v2

Physics

Condensed Matter

Superconductivity

4 pages RevTex, 3 PostScript figures, 27 refs

Scientific paper

A phenomenological model is proposed for melting of a vortex lattice, based on screening of the elastic shear modulus by mobile or partially pinned dislocations. A first-order softening line is found and ends at a critical point beyond which the lattice crosses over to an hexatic vortex solid. The consequences of softening on vortex dynamics are explored, as fingerprints of plastic dynamics: a reentrance of single vortex behaviour, for both depinning and collective creep, occurs as the field increases, with non-monotonous creep exponents. This general scenario is supported by recent experiments in high-$T_c$ materials and suggests that for a 3D vortex lattice at low temperature the field induces a continuous order-disorder transition towards a glassy phase.

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