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首页> 美国卫生研究院文献>Scientific Reports >Ultrasensitive interplay between ferromagnetism and superconductivity in NbGd composite thin films
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Ultrasensitive interplay between ferromagnetism and superconductivity in NbGd composite thin films

机译：NbGd复合薄膜中铁磁与超导之间的超灵敏相互作用

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摘要

A model binary hybrid system composed of a randomly distributed rare-earth ferromagnetic (Gd) part embedded in an s-wave superconducting (Nb) matrix is being manufactured to study the interplay between competing superconducting and ferromagnetic order parameters. The normal metallic to superconducting phase transition appears to be very sensitive to the magnetic counterpart and the modulation of the superconducing properties follow closely to the Abrikosov-Gor’kov (AG) theory of magnetic impurity induced pair breaking mechanism. A critical concentration of Gd is obtained for the studied NbGd based composite films (CFs) above which superconductivity disappears. Besides, a magnetic ordering resembling the paramagnetic Meissner effect (PME) appears in DC magnetization measurements at temperatures close to the superconducting transition temperature. The positive magnetization related to the PME emerges upon doping Nb with Gd. The temperature dependent resistance measurements evolve in a similar fashion with the concentration of Gd as that with an external magnetic field and in both the cases, the transition curves accompany several intermediate features indicating the traces of magnetism originated either from Gd or from the external field. Finally, the signatures of magnetism appear evidently in the magnetization and transport measurements for the CFs with very low (<1 at.%) doping of Gd.
机译：为了研究竞争性超导和铁磁有序参数之间的相互作用，正在制造一种由嵌入在s波超导（Nb）矩阵中的随机分布的稀土铁磁（Gd）部分组成的模型二进制混合系统。正常的金属到超导的相变似乎对磁对应物非常敏感，并且超导特性的调制遵循磁杂质引起的成对断裂机理的Abrikosov-Gor’kov（AG）理论。对于所研究的基于NbGd的复合膜（CF），获得了临界的Gd浓度，在该浓度以上，超导性消失了。此外，在接近超导转变温度的温度下，直流磁化测量中会出现类似于顺磁迈斯纳效应（PME）的磁排序。当Nb掺杂Gd时，会出现与PME相关的正磁化强度。温度依赖性电阻测量在Gd浓度与外部磁场相似的情况下发展，在两种情况下，过渡曲线都伴随着几个中间特征，表明磁迹来自Gd或外部磁场。最后，在极低（<1 at。％）Gd掺杂的CF的磁化和输运测量中，磁性特征明显出现。

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