Abstract
We have investigated the transport and magnetic properties of the recently discovered superconducting materials MgB 2. We obtained irreversibility temperature T r( H) and irreversibility field H r( T) from magnetic measurements. The irreversibility temperature T r( H) was determined from the merging temperature of the magnetic moment observed in the zero field cooling process in to the one in field cooling process. We also defined the transport irreversibility temperature B c2 from resistivity measurements at zero-resistivity in the presence of magnetic field. Those results of the irreversibility lines are plotted in H– T plane. The magnetic irreversibility lines are consistent with each other, while the transport one locates at the higher temperature side.
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