Abstract
Sintered MgB2 system was prepared under 3.5GPa in the WC cubic anvil cell above 1100°C for 1h from the commercial MgB2. In this system, a few large flux jumps (FJ) were observed in the magnetization curve at 5K on the field increasing process. Especially, the complete FJ occurred near 0 field. The number of large FJ decreased at higher temperature of 20K. We estimated the flux density difference between the center and surface of the sample from the extended critical state model and magnetization data. The generation condition of FJ was discussed using Schwartz–Bean’s theory and Wipf’s theory. The FJ was suppressed at 20K by the MgCu2 doping. We assumed that the present large FJ’s were induced by the enlarged sample thickness by high pressure sintering. A few mol% of MgCu2 impurities reduced the thickness of MgB2 phase or enhanced the thermal conductivity of HP sample.
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