Abstract
We have investigated the transport and magnetic properties of the recently discovered superconducting MgB2. We obtained irreversibility temperature Tr(H) and irreversibility field Hr(T) from magnetic measurement and irreversibility field Bc2 from resistivity measurement. The irreversibility temperature Tr(H), was determined from the merging temperature of the magnetic moment observed in the zero field cooling (ZFC) process in to the one in field cooling (FC) process. We define the transport irreversibility line from the temperature at zero-resistivity in the presence of magnetic field. We also measured the magnetic relaxation of the remanent. The sample was cooled in zero field and the field above H*, where the flux front penetrated at the center of the sample. The time decay of the remanent moment was measured for about 105 s. The relaxation of the remanent moment showed the linear ln (t) dependence in the whole observed temperature range. 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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