摘要
The new superconductor MgB_(2) has been prepared by two ways: high pressure and ambient pressure synthesis. Their superconducting properties were measured and compared. It is found that the sample prepared by high pressure is much denser than that prepared under ambient pressure. Accordingly the high pressure sample has a very narrow transition width and a much higher bulk critical current density.
基金
Supported by the Ministry of Science and Technology of China(NKBRSF-G19990646)
the National Natural Science Foundation of China under Grant No.19825111。
