Flux dynamics and vortex phase diagram of the new superconductor $Mg{B}_2$

H. H. Wen, S. L. Li, Z. W. Zhao +4

Magnetic critical current density and relaxation rate have been measured on $Mg{B}_2$ bulks from 1.6 K to $T_c$ at magnetic fields up to 8 Tesla. A vortex phase diagram is depicted b…