论文标题
超导体/正常金属条的峰值效应在无涡体状态下
Peak effect in a superconductor/normal metal strip being in vortex-free state
论文作者
论文摘要
从理论上讲，我们的临界电流$ I_C $和磁化$ m $的混合超导体/正常金属（SN）条可能对垂直磁场具有非单调的依赖性 - 因此称为峰值效应。与熟悉的峰值效应相反，峰值效应与涡流进入超导体或涡旋固定的特殊性相反，发现的现象存在于无涡体（Meissner）阶段。我们认为，当其平面电流 - 螺旋级别关系具有两个最大值时，该效果出现在研究的杂种结构的特定参数上。我们预计，在两个波段超导体（例如MGB $ _2 $）中可能存在相同的峰值效应，在低温下预测相似的电流 - 螺旋级依赖性。
We theoretically predict that the critical current $I_c$ and magnetization $M$ of hybrid superconductor/normal-metal (SN) strip may have nonmonotonous dependence on perpendicular magnetic field - so called peak effect. In contrast to familiar peak effect, which is connected either with vortex entry to the superconductor or with peculiarities of vortex pinning, the found phenomenon exists at low fields, in the vortex-free (Meissner) phase. We argue that the effect appears at specific parameters of studied hybrid structure when its in-plane current-supervelocity relation has two maxima. We expect that the same peak effect may exist in two-band superconductors (like MgB$_2$) where similar current-supervelocity dependence was predicted at low temperatures.
