Fe-K β X-ray emission spectroscopy measurements reveal an asymmetric doping dependence of the magnetic moments μ bare in electron-and hole-doped BaFe2As2. At low temperature, μ bare is nearly constant in hole-doped samples, whereas it decreases upon electron doping. Increasing temperature substantially enhances μ bare in the hole-doped region, which is naturally explained by the theoretically predicted crossover into a spin-frozen state. Our measurements demonstrate the importance of Hund's-coupling and electronic correlations, especially for hole-doped BaFe2As2, and the inadequacy of a fully localized or fully itinerant description of the 122 family of Fe pnictides.
Magnetic moment evolution and spin freezing in doped BaFe2As2 / Pelliciari, J., Huang, Y., Ishii, K., Zhang, C., Dai, P., Chen, G.F., Xing, L., Wang, X., Jin, C., Ding, H., Werner, P., Schmitt, T.. - In: SCIENTIFIC REPORTS. - ISSN 2045-2322. - 7:1(2017), pp. 1-6. [10.1038/s41598-017-07286-6]
Magnetic moment evolution and spin freezing in doped BaFe2As2
Pelliciari, Jonathan;
2017
Abstract
Fe-K β X-ray emission spectroscopy measurements reveal an asymmetric doping dependence of the magnetic moments μ bare in electron-and hole-doped BaFe2As2. At low temperature, μ bare is nearly constant in hole-doped samples, whereas it decreases upon electron doping. Increasing temperature substantially enhances μ bare in the hole-doped region, which is naturally explained by the theoretically predicted crossover into a spin-frozen state. Our measurements demonstrate the importance of Hund's-coupling and electronic correlations, especially for hole-doped BaFe2As2, and the inadequacy of a fully localized or fully itinerant description of the 122 family of Fe pnictides.
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