Magnetic moment evolution and spin freezing in doped BaFe2As2

Abstract

Fe-K β X-ray emission spectroscopy measurements reveal an asymmetric doping dependence of the magnetic moments μbare in electron- and hole-doped BaFe2As2. At low temperature, μbare is nearly constant in hole-doped samples, whereas it decreases upon electron doping. Increasing temperature substantially enhances μbare 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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Pelliciari, Jonathan, Huang, Yaobo, Ishii, Kenji, et al.. "Magnetic moment evolution and spin freezing in doped BaFe2As2." Scientific Reports, 7, (2017) Springer Nature: https://doi.org/10.1038/s41598-017-07286-6.

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