Creation of long living vortex-antivortex matter by laser pulse

Relaxational dynamics of the supercooled normal domain with magnetic flux i nside in a type-II superconductor is considered It is shown numerically tha t the restoration of superconductivity is accompanied by explosive nucleati on of topological vortices and antivortices. On a longer time scale some of them can survive being trapped by the pinning centers. Such a phase consis ting of Abrikosov vortices and antivortices can live for a macroscopically long time. A week external magnetic field causes the antivortices to leave the sample, thus increasing the magnetic flux inside.