Fluctuating magnetism of Co- and Cu-doped NaFeAs

Abstract

We report an x-ray emission spectroscopy (XES) study of the local fluctuating magnetic moment (${\mu }_{bare}$) in $\mathrm{NaF}{\mathrm{e}}_{1-\mathrm{x}}\mathrm{C}{\mathrm{o}}_{\mathrm{x}}\mathrm{As}$ and $\mathrm{NaF}{\mathrm{e}}_{1-\mathrm{x}}\mathrm{C}{\mathrm{u}}_{\mathrm{x}}\mathrm{As}$. In NaFeAs, the reduced height of the As ions induces a local magnetic moment higher than $\mathrm{B}{\mathrm{a}}_2\mathrm{A}{\mathrm{s}}_2$, despite lower T${}_N$ and ordered magnetic moment. As NaFeAs is doped with Co ${\mu }_{bare}$ 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 ${\mu }_{bare}$ with temperature in all samples as observed in electron- and hole-doped $\mathrm{BaF}{\mathrm{e}}_2\mathrm{A}{\mathrm{s}}_2$. 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.

arXiv comment17 pages, 4 figures, 1 table

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Cited by in corpus (2)

• The drastic effect of the impurity scattering on the electronic and superconducting properties of Cu-doped FeSe
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