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EXOTIC PROXIMITY EFFECTS IN SUPERCONDUCTOR/FERROMAGNET STRUCTURE

机译:超导/铁磁体结构中的异国近似效应

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We study a possibility to obtain a new type of superconductivity (s-wave, triplet, odd in Matsubara frequencies) in superconductor/ferromagnet (S/F) structures. A special attention is paid to multilayered S/F structures with the magnetization vector inclined in neighboring F layers by an angle a. It is shown that not only a singlet, but also triplet component exists in the stmcture which peneti'ates into the F layers over a long distance. The long-range penetration of the triplet component insures the Josephson coupling. The sign of the Josephson coupling between the nearest S layers (S; and S_(i+1)) depends on chirality of the system, i.e., on sign of the product aim+i. Therefore in-plane superconductivity in the structure is caused by the singlet component and transverse superconductivity is due to the triplet component (odd superconductivity). We also study ferromagnetism induced in the superconductor due to the inverse proximity effect. It turns out that the magnetization M induced in S is opposite to M in the ferromagnet and spreads over a distance of order of the correlation length.
机译:我们研究了在超导体/铁磁体(S / F)结构中获得了一种新型的超导(S波,三联网,Matsubara频率中的S-Wave)。通过角度a在相邻的f层倾斜的磁化矢量,对多层s / f结构支付给多层s / f结构。结果表明,不仅在长距离内切入F层的stmcture中存在三态组件,还存在三态分量。三重态分量的远程渗透确保了约瑟夫森耦合。在最近的S层之间的Josephson耦合的标志(s;和s_(i + 1))取决于系统的手性,即产品瞄准+ i的标志。因此,结构中的面内超导是由单态分量和横向超导导致的是三重组件(奇数超导性)。我们还通过逆接近效应研究在超导体中诱导的铁磁性。事实证明,在S中诱导的磁化M与铁圆形中的M相对,并且在相关长度的距离上铺展。

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