Magnetic moment evolution and spin freezing in doped BaFe${}_2$As${}_2$

Abstract

Fe-K${}_{\beta }$ X-ray emission spectroscopy measurements reveal an asymmetric doping dependence of the magnetic moments ${\mu }_{\text{bare}}$ in electron- and hole-doped BaFe${}_2$As${}_2$. At low temperature, ${\mu }_{\text{bare}}$ is nearly constant in hole-doped samples, whereas it decreases upon electron doping. Increasing temperature substantially enhances ${\mu }_{\text{bare}}$ 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 BaFe${}_2$As${}_2$, and the inadequacy of a fully localized or fully itinerant description of the 122 family of Fe pnictides.

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• Reciprocity between local moments and collective magnetic excitations in the phase diagram of BaFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$
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• Spin freezing and the Sachdev-Ye model
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• Fluctuating magnetism of Co- and Cu-doped NaFeAs