Molecular Dynamics of Type-1.5 Superconductors

In multi-component superconductors and structures of interlaced layered type-I type-II layers there exists a range of parameters where inter-vortex interaction is repulsive at short ranges and attractive at long range. Such regimes were termed ``type-1.5 superconductivity'' recently. This vortex interaction leads to a microscopic phase separation in Meissner and vortex droplets. In this talk, we utilize molecular dynamics to investigate the magnetic response of such superconductors in the type-1.5 regimes.