【摘要】 实验研究了 Bi（Pb）SrCaCuO 大块超导体在77.3K 下,50—2000Oe 磁场范围的磁通蠕动速率以及在150Oe、300Oe 磁场下磁通蠕动速率与温度的关系.并估算了它的磁通钉扎势,在77.3K 下,磁通钉扎势符合 U_o∝H^-α关系,且在50—800Oe 磁场范围α=0.87;在800—2000Oe 磁场范围α=0.28;在一定磁场下,液氮温度以上磁通钉扎势 U_o 随温度的升高而减小.更多还原

【Abstract】 The flux creep rate at 77.3 K for the fields below 2000 Oe,and the relation between flux creep rate and temperature for the fields of 150,300 Oe have been experimentally researched in Bi(Pb) SrCaCuO bulk superconductor The flux pinning potential is estimated,U0∝H-a with a=0.87 in the fields from 50 Oe to 800 Oe,with a=0.28 in the fields from 800 Oe to 2000 Oe.There is a decrease of flux pinning potential U0 with the increase of temperature above 77.3 K in a certain field.更多还原