Huge critical current density and tailored superconducting anisotropy in SmFeAsO0.8F0.15 by low-density columnar-defect incorporation
Huge critical current density and tailored superconducting anisotropy in SmFeAsO0.8F0.15 by low-density columnar-defect incorporation
复制标题
DOI：
10.1038/ncomms3655
复制
发表时间：
2013-11-01
影响因子：
16.6
通讯作者：
Kwok, W. K.
中科院分区：
文献类型：
--
作者：
Fang, L.;Jia, Y.;Kwok, W. K.
铁基超导体由于其相对高的临界电流密度和上临界场而可用于电力分配和超导磁体应用。SmFeAsO0.8F0.15特别令人感兴趣，因为它在这些材料中具有最高的转变温度。在这里，我们表明，通过重离子辐照在这种材料中引入低密度的相关纳米级缺陷，我们可以在5 K下将其临界电流密度提高到2 x 10（7）A cm（-2）-这是铁基超导体有史以来报道的最高值-而不会降低其临界温度50 K。我们还观察到一个显着的减少，在热力学超导各向异性，从8到4照射后。我们开发了一个模型的基础上各向异性的电子散射，预测超导各向异性可以通过半金属，完全间隙II型超导体的相关缺陷定制。
Iron-based superconductors could be useful for electricity distribution and superconducting magnet applications because of their relatively high critical current densities and upper critical fields. SmFeAsO0.8F0.15 is of particular interest as it has the highest transition temperature among these materials. Here we show that by introducing a low density of correlated nano-scale defects into this material by heavy-ion irradiation, we can increase its critical current density to up to 2 x 10(7) A cm(-2) at 5 K-the highest ever reported for an iron-based superconductor-without reducing its critical temperature of 50 K. We also observe a notable reduction in the thermodynamic superconducting anisotropy, from 8 to 4 upon irradiation. We develop a model based on anisotropic electron scattering that predicts that the superconducting anisotropy can be tailored via correlated defects in semimetallic, fully gapped type II superconductors.