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arXiv 2007.11351cond-mat.supr-concond-mat.mes-hall
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磁场在Fulde-Ferrell超导带材中引起的全局顺磁响应

Magnetic field induced global paramagnetic response in Fulde-Ferrell superconducting strip

P. M. Marychev, V. D. Plastovets, D. Yu. Vodolazov

摘要:

本文从理论上研究了超导体/铁磁体/普通金属(SFN)带在面内Fulde-Ferrell(FF)态下的磁响应。与普通超导带材不同,通过增加垂直磁场,FF带材可以从抗磁状态转变为顺磁状态,然后再转变为抗磁状态。在顺磁状态下,FF带呈现出磁场驱动的从FF态到普通态的二级相变,沿带没有空间调制。我们认为,这种整体顺磁响应与FF态超导电流密度对超速度的特殊依赖关系有关,并且存在于非线性区域。

英文摘要:

We theoretically study magnetic response of a superconductor/ferromagnet/normal-metal (SFN) strip in an in-plane Fulde--Ferrell (FF) state. We show that unlike to ordinary superconducting strip the FF strip can be switched from diamagnetic to paramagnetic and then back to diamagnetic state by {\it increasing} the perpendicular magnetic field. Being in paramagnetic state FF strip exhibits magnetic field driven second order phase transition from FF state to the ordinary state without spatial modulation along the strip. We argue that the global paramagnetic response is connected with peculiar dependence of sheet superconducting current density on supervelocity in FF state and it exists in nonlinear regime.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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