Magnetic moment evolution and spin freezing in doped BaFe2As2


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.

Journal article

Pelliciari, Jonathan, Huang, Yaobo, Ishii, Kenji, et al.. "Magnetic moment evolution and spin freezing in doped BaFe2As2." Scientific Reports, 7, (2017) Springer Nature:

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