峰值效应中集体相互作用对重入钉扎的强化
The strengthening of reentrant pinning by collective interactions in the peak effect
摘要：
自从大约40年前首次观察到峰值效应以来，它一直是许多研究的主题，主要是为了确定其确切机制。尽管作出了这些努力，但尚未就此问题达成共识。实验上，峰值效应表明在高磁场下从退钉扎涡旋相到重入钉扎相的转变。为了研究本征钉扎对峰值效应的影响，我们考虑了Fe-$_{x}$-Ni $_{1-x}$-Zr $_{2}$超导金属玻璃，其中涡旋钉扎力随Fe含量的变化而变化，并且其中一个巨大的峰值效应被看作是磁场的函数。结果绘制成相图，其中很容易看出，峰值效应随着钉扎力的减小而变宽。通常情况下，钉扎可以通过增加钉扎中心来理解，但在这里，我们表明，重入钉扎是由于相互作用的加强（同时降低钉扎强度）。我们的结果表明，峰效应的加强集体效应。
英文摘要：
Since it was first observed about 40 years ago [1], the peak effect has been the subject of numerous research mainly impelled by the desire to determine its exact mechanisms. Despite these efforts, a consensus on this question has yet to be reached. Experimentally, the peak effect indicates a transition from a depinned vortex phase to a reentrant pinning phase at high magnetic field. To study the effects of intrinsic pinning on the peak effect, we consider Fe$_{x}$Ni$_{1-x}$Zr$_{2}$ superconducting metallic glasses in which the vortex pinning force varies depending on the Fe content and in which a huge peak effect is seen as a function of magnetic field. The results are mapped out as a phase diagram in which it is readily seen that the peak effect becomes broader with decreasing pinning force. Typically, pinning can be understood by increased pinning centers, but here, we show that reentrant pinning is due to the strengthening of interactions (while decreasing pinning strength). Our results demonstrate the strengthening of the peak effect by collective effects.
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