Supported by the National Natural Science Foundation of China under Grant No.19825111;the Ministry of Science and Technology of China(NKBRSF-G1999064602).
By using transport and magnetic measurement,the upper critical field H_(c2)(T)and the irreversibility line Hirr(T)has been determined.A big separation between H_(c2)(0)and Hirr(0)has been found showing the existence o...
Supported by the Ministry of Science and Technology of China(NKBRSF-G19990646);the National Natural Science Foundation of China under Grant No.19825111.
Resistive transitions of the new superconductor MgB_(2) are carried out under magnetic fields from 0 to 8 T.It is found that the irreversibility field Hirr(T)and the upper critical field Hc2(T)obtained are very close ...
Supported by the Ministry of Science and Technology of China(NKBRSF-G1999064602);the National Natural Science Foundation of China under Grant No.59872043;the Fundamental Research Bureau,Chinese Academy of Sciences.
Polycrystalline samples of the new superconductor MgB_(2) are prepared by solid state reaction using Mg and B powders.The resistance measurement shows that the onset transition temperature and zero resistance transiti...
Supported by the Ministry of Science and Technology of China(NKBRSF-G19990646);the National Natural Science Foundation of China under Grant No.19825111。
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 pre...