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熔融织构YBa2Cu3O7-δ的临界电流的鱼尾效应
Fishtail Effect of the Critical Current for Melt Textured YBa2Cu3O7-δ Crystal
【摘要】 实验中用振动样品磁强计测量了熔融织构YBa2Cu3O7-δ的磁化曲线.并且根据Bean模型利用磁化曲线计算得到临界电流密度,发现在所测数据中仅在T=77K和83K观察到鱼尾效应,而且随着温度的降低,鱼尾效应的峰值向大磁场方向移动.进一步的分析表明鱼尾效应和两个因素有关.
【Abstract】 The magnetization curves of YBa2Cu3O7-x crystal prepared by melt-textured growth method were measured in a vibrating sample magnetometer(VSM).The critical current density JC was calculated from the magnetization by using Bean model.We only observe the fishtail effect(peak effect) at T=77K and 83K,and also the maximum value of JC shift towards higher fields as temperature decreased.Further investigation shows that the fishtail effect is the competitive result of the glassy exponent μ and the pinning energy U0,which are varying with magnetic field and temperature.
【关键词】 临界电流；
鱼尾效应；
集体钉扎理论；
【Key words】 critical current density； fishtail effect； collective pinning theory；
【Key words】 critical current density； fishtail effect； collective pinning theory；
- 【文献出处】 雁北师范学院学报 ,Journal of Yanbei Normal University , 编辑部邮箱 ,2007年02期
- 【分类号】O511
- 【下载频次】49