含磁性Pr杂质的La超导体的先驱体抗磁性与磁场的关系
Magnetic field dependence of the precursor diamagnetism in La superconductors with magnetic Pr impurities
摘要：
通过测量含镨杂质镧系超导体在Tc以上的涨落抗磁性（FD）随磁场的变化关系，研究了常规BCS低Tc超导体中涨落库珀对与磁性杂质之间的相互作用。这些测量为我们以前的观察提供了重要的证实[Europys。Lett. 73，587（2006）]，在稀杂质状态下，FD几乎随磁性杂质的浓度线性增加。这种惊人的效果归因于由于磁性杂质之间的耦合的波动库珀对的存在而引起的变化。为了描述这些结果在现象学水平上，我们提出了一个高斯Ginzburg-Landau模型的FD，其中包括一个间接的贡献成正比的杂质浓度和库珀对密度。我们的方法是能够同时解释FD增加由于磁性杂质和它的减少与应用程序的大磁场。
英文摘要：
The interplay between fluctuating Cooper pairs and magnetic impurities in conventional BCS low-Tc superconductors has been studied through measurements of the magnetic field dependence of the fluctuation diamagnetism (FD) above Tc in lanthanum with praseodymium impurities. These measurements provide a crucial confirmation of our previous observation [Europhys. Lett. 73, 587 (2006)] that in the dilute impurity regime the FD increases almost linearly with the concentration of magnetic impurities. This striking effect is attributed to a variation due to the presence of the fluctuating Cooper pairs of the coupling between magnetic impurities. To describe these results at a phenomenological level, we propose a Gaussian Ginzburg-Landau model for the FD which includes an indirect contribution proportional to both the impurities concentration and the Cooper pairs density. Our approach is able to explain simultaneously the FD increase due to magnetic impurities and its decrease with the application of large magnetic fields.
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