最佳电子掺杂超导体LaFeAsO $_{1-x}$ F $_{x}$中临界温度与压力下超流密度的相互独立性
Mutual independence of critical temperature and superfluid density under pressure in optimally electron-doped superconducting LaFeAsO$_{1-x}$F$_{x}$
摘要：
本文研究了LaFeAsO $_{1-x}$ F $_{x}$在最佳电子掺杂条件下，在外加压力高达$\sim 23$ kbar时的超导性质。μ子自旋谱和直流磁力测量的证据之间的临界温度$T_{c}$和低温饱和值的比率$n_{s}/m^{*}$（超流密度超过有效带质量的库珀对）的明确的相互独立性。值得注意的是，对于$n_{s}/m^{*}$，在最大压力值下报告了$\sim 30$ %的显著增加，而$T_{c}$在整个访问的实验窗口中基本上不受影响。我们认为，并证明，所观察到的结果的解释必须考虑到非磁性杂质的多带超导的影响。特别是，独特的可能性，以修改带内和带间散射率之间的比率，通过作用于结构参数，同时保持化学无序常数的量是一个惊人的结果，我们提出的模型。
英文摘要：
The superconducting properties of LaFeAsO$_{1-x}$F$_{x}$ in conditions of optimal electron-doping are investigated upon the application of external pressure up to $\sim 23$ kbar. Measurements of muon-spin spectroscopy and dc magnetometry evidence a clear mutual independence between the critical temperature $T_{c}$ and the low-temperature saturation value for the ratio $n_{s}/m^{*}$ (superfluid density over effective band mass of Cooper pairs). Remarkably, a dramatic increase of $\sim 30$ % is reported for $n_{s}/m^{*}$ at the maximum pressure value while $T_{c}$ is substantially unaffected in the whole accessed experimental window. We argue and demonstrate that the explanation for the observed results must take the effect of non-magnetic impurities on multi-band superconductivity into account. In particular, the unique possibility to modify the ratio between intra-band and inter-bands scattering rates by acting on structural parameters while keeping the amount of chemical disorder constant is a striking result of our proposed model.
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