Spin polarization of Ru in superconducting Ba(Fe_{0.795}Ru_{0.205})₂As₂ studied by x-ray resonant magnetic scattering

M. G. Kim , J. Soh , J. Lang , M. P. M. Dean , A. Thaler , S. L. Bud'ko , P. C. Canfield , E. Bourret-Courchesne

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A. Kreyssig A. I. Goldman R. J. Birgeneau

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classification ❄️ cond-mat.str-el cond-mat.supr-con

keywords edgemagneticresonantscatteringvectorx-rayxrmsantiferromagnetic

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We have employed the x-ray resonant magnetic scattering (XRMS) technique at the Ru $L_2$ edge of the Ba(Fe$_{1-x}$Ru$_x$)$_2$As$_2$ ($x = 0.205$) superconductor. We show that pronounced resonance enhancements at the Ru $L_2$ edge are observed at the wave vector which is consistent with the antiferromagnetic propagation vector of the Fe in the undoped BaFe$_2$As$_2$. We also demonstrate that the XRMS signals at the Ru $L_2$ edge follow the magnetic ordering of the Fe with a long correlation length, $\xi_{ab} > 2850\pm400$ \AA . Our experimental observation shows that the Ru is spin-polarized in Ba(Fe$_{1-x}$Ru$_x$)$_2$As$_2$ compounds.

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Spin polarization of Ru in superconducting Ba(Fe_{0.795}Ru_{0.205})₂As₂ studied by x-ray resonant magnetic scattering

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