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我们提出一个模型,解释了磁通钉扎不均匀超导体的历史效应.钉扎不同由不同的临界电流密度jc来表征.基于这种模型以及磁通扩散方程,数值计算表明不均匀超导体的V-I输运特性曲线具有明显的历史效应,即升降电流时电压具有不可逆性,且这种不可逆性对电流扫描速度非常敏感而对磁场很不敏感.我们的银包套Bi2-xPbxSr2Ca2Cu3Oy电输运实验和文献的同样都显示出这种不可逆性,从而验证了我们的模型.

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