Local antiferromagnetic correlations in the iron pnictide superconductors LaFeAsO{1-x}F{x} and Ca(Fe,Co)2As2 as seen via normal-state susceptibility

R. Klingeler , N. Leps , I. Hellmann , A. Popa , U. Stockert , C. Hess , V. Kataev , H.-J. Grafe

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F. Hammerath G. Lang G. Behr L. Harnagea S. Singh B. Buechner

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classification ❄️ cond-mat.supr-con

keywords antiferromagneticcorrelationsironlafeasolocalsuperconductivitysusceptibilityappears

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We have studied the interplay of magnetism and superconductivity in LaFeAsO$_{1-x}$F$_x$ and Ca(Fe$_{1-x}$Co$_x$)$_2$As$_2$. While antiferromagnetic spin density wave formation is suppressed and superconductivity evolves, all samples show a doping independent strong increase of the normal state susceptibility upon heating which appears a general feature of iron pnictides. The data provide evidence for robust local antiferromagnetic correlations persisting even in the superconducting regime of the phase diagram.

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Local antiferromagnetic correlations in the iron pnictide superconductors LaFeAsO{1-x}F{x} and Ca(Fe,Co)2As2 as seen via normal-state susceptibility

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