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Revealing the dual nature of magnetism in iron pnictides and iron chalcogenides using x-ray emission spectroscopy

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arxiv 1107.2211 v1 pith:PI42P5ZT submitted 2011-07-12 cond-mat.supr-con cond-mat.str-el

Revealing the dual nature of magnetism in iron pnictides and iron chalcogenides using x-ray emission spectroscopy

H. Gretarsson , A. Lupascu , Jungho Kim , D. Casa , T. Gog , W. Wu , S. R. Julian , Z. J. Xu
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J. S. Wen G. D. Gu R. H. Yuan Z. G. Chen N.-L. Wang S. Khim K. H. Kim M. Ishikado I. Jarrige S. Shamoto J.-H. Chu I. R. Fisher Young-June Kim
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classification cond-mat.supr-con cond-mat.str-el
keywords localironmomentsemissionfamiliesmagneticmomentpnictides
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abstract

We report Fe K beta 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 (A=K, Rb, and Cs). The moment size varies significantly across different families. Specifically, all iron pnictides samples have local moments of about 1 $\mu_B$/Fe, while FeTe and K2Fe4Se5 families have much larger local moments of ~2$\mu_B$/Fe, ~3.3$\mu_B$/Fe, respectively. In addition, we find that neither carrier doping nor temperature change affects the local moment size.

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