Physics – Condensed Matter – Superconductivity
Scientific paper
2010-11-18
Phys. Rev. B 83, 184514 (2011)
Physics
Condensed Matter
Superconductivity
7 pages, 5 figures
Scientific paper
10.1103/PhysRevB.83.184514
We study theoretically dynamical phases of vortices in superconducting films with arrays of obstacles. By performing a series of molecular dynamics simulations and analytical calculations, we demonstrate the existence of a phase of soliton-like vortex-density waves appearing in a wide range of parameters. These waves are formed by a self-assembled phase separation process induced by strongly nonlinear density fluctuations of the moving vortex matter above a certain critical driving current. At high vortex concentrations, the waves move at an approximately current-independent speed resulting in a wide plateau in the voltage-current characteristics. At stronger drives, the vortex system enters into a fully jammed (zero-voltage) phase. By combining ac and dc drives, the interplay between the vortex-density-wave and jammed phases leads to the observation of negative absolute mobility of vortices, which induces the superconducting film into a negative resistance state.
da Silva Rogério M.
Souza Silva Clécio C. de
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