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arXiv 2203.09244cond-mat.supr-con
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超导体/正常金属带无涡旋状态下的峰值效应

Peak effect in a superconductor/normal metal strip being in vortex-free state

P. M. Marychev, D. Yu. Vodolazov

摘要:

理论上预言了混合超导体/正常金属(SN)带材的临界电流$I_c$和磁化强度$M$对垂直磁场的非单调依赖性,即峰值效应.在熟悉的峰值效应,这是连接无论是与涡旋进入超导体或与特性的涡旋钉扎,发现的现象存在于低场,在无涡(迈斯纳)相。我们认为,当所研究的混合结构的面内电流-超高速关系具有两个极大值时,这种效应出现在特定的参数下。我们预计,同样的峰值效应可能存在于双带超导体(如MgB $_2$)中,在低温下预测了类似的电流-超速度依赖性。

英文摘要:

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.

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