Evidence for Transition Temperature Fluctuation Induced Pinning im MgB${}_2$ Superconductor

M. J. Qin, X. L. Wang, H. K. Liu +1

The magnetic field dependent critical current density $j_c(B)$ of a MgB${}_2$ bulk sample has been obtained by means of magnetization hysteresis measurements. The $j_c(B)$ curves at…