本文报道交流磁场对高温超导体交流损耗Q的影响.基于对数型位垒的巨磁通蠕动模型,我们进行的数值计算证明,交流损耗与交流振幅的关系在定性上是和临界态模型相同的,即与振幅的m次方成正比:Q∝(Bac)m.但是,m不是像Bean模型预言的那样只有m=1和m=3的两个值,而是渐变的,MgB2和Ag/Bi2223样品的实验结果支持我们的结论.
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