Co和Cu掺杂NaFeAs的涨落磁性
Fluctuating magnetism of Co- and Cu-doped NaFeAs
摘要：
本文报道了$\mathrm{NaFe_{1-x}Co_{x}As}$和$\mathrm{NaFe_{1-x}Cu_{x}As}$中局域涨落磁矩（$μ_{bare}$）的X射线发射光谱（XES）研究。在NaFeAs中，As离子的降低的高度诱导高于$\mathrm{Ba_2As_2}$的局部磁矩，尽管T $_N$较低且有序磁矩。当NaFeAs掺杂Co时，$μ_{bare}$略有减少，而Cu掺杂使其不受影响，表明不同的掺杂机制：Co基于电子计数，而Cu的情况下杂质散射占主导地位。最后，我们观察到在所有样品中的电子和空穴掺杂的$\mathrm{BaFe_2As_2}$的$μ_{bare}$随温度的增加。由于Co和Cu的掺杂显示超导性，我们的研究结果表明，形成的库珀对是没有连接的波动的顺磁矩的完全损失。
英文摘要：
We report an x-ray emission spectroscopy (XES) study of the local fluctuating magnetic moment ($μ_{bare}$) in $\mathrm{NaFe_{1-x}Co_{x}As}$ and $\mathrm{NaFe_{1-x}Cu_{x}As}$. In NaFeAs, the reduced height of the As ions induces a local magnetic moment higher than $\mathrm{Ba_2As_2}$, despite lower T$_N$ and ordered magnetic moment. As NaFeAs is doped with Co $μ_{bare}$ is slightly reduced, whereas Cu doping leaves it unaffected, indicating a different doping mechanism: based on electron counting for Co whereas impurity scattering dominates in the case of Cu. Finally, we observe an increase of $μ_{bare}$ with temperature in all samples as observed in electron- and hole-doped $\mathrm{BaFe_2As_2}$. Since both Co and Cu doping display superconductivity, our findings demonstrate that the formation of Cooper pairs is not connected with the complete loss of fluctuating paramagnetic moments.
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