We report a Fe Kβ x-ray emission spectroscopy study of local magnetic moments in various iron-based superconductors in their paramagnetic phases. Local magnetic moments are found in all samples studied: PrFeAsO, Ba(Fe,Co)₂As₂, LiFeAs, Fe₁₊ₓ(Te,Se), and A₂Fe₄Se₅ (where A=K, Rb, and Cs). The moment size is independent of temperature or carrier concentration but varies significantly across different families. Specifically, all iron pnictide samples have local moments of about 1μB/Fe, while FeTe and K₂Fe₄Se₅ families have much larger local moments of ~2μB/Fe and ~3.3μB/Fe, respectively. Our results illustrate the importance of multiorbital physics in describing magnetism of these compounds.
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Gretarsson et al. (2011) studied this question.
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