论文标题
磁场诱导FULDE-FERRELL超导带中的全局顺磁反应
Magnetic field induced global paramagnetic response in Fulde-Ferrell superconducting strip
论文作者
论文摘要
我们从理论上研究了平面fulde-ferrell（ff）状态中超导体/非磁性/正常金属（SFN）条的磁反应。我们表明，与普通的超导条不同，FF条可以从dimagnetic转换为顺磁性，然后通过{\ it增加}垂直磁场返回到Diamagnetic状态。在顺磁状态FF条中，磁场驱动的二阶相位从FF状态到普通状态，而没有沿条带空间调制。我们认为，全局的顺磁反应与板超导电流密度对FF状态的超级速度的特殊依赖性有关，并且它存在于非线性状态下。
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.
