Commensurate antiferromagnetic ordering in Ba(Fe$_{1-x}$Co$_{x})_{2}$As$_{2}$ determined by x-ray resonant magnetic scattering at the Fe $K$ edge

ORAL

Abstract

We describe x-ray resonant magnetic diffraction measurements at the Fe $K$ edge of both the parent BaFe$_{2}$As$_{2}$ and superconducting Ba(Fe$_{0.953}$Co$_{0.047})_{2}$As$_{2}$ compounds. From these high-resolution measurements we conclude that the magnetic structure is commensurate for both compositions. The energy spectrum of the resonant scattering is in reasonable agreement with theoretical calculation using the full-potential linear augmented plane-wave method with a local density functional. The calculation suggests that the resonant scattering at the Fe $K$ edge in the $\sigma $-to-$\pi $ scattering channel arises from dipole allowed transitions from the core 1$s$ states to the unoccupied 4$p$ states that are spin polarized due to hybridization with the 3$d$ states close to the Fermi energy.

*The work at the Ames Laboratory was supported by the DMSE, Office of Basic Energy Science, the US DOE, under contract No. DE-AC02-07CH11358.

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Authors

  • M.G. Kim

    • Ames Laboratory and Dep. of Physics and Astronomy, Iowa State University, Ames

  • A. Kreyssig

    • Ames Laboratory and Dep. of Physics and Astronomy, Iowa State University, Ames

  • Y.B. Lee

    • Ames Laboratory and Dep. of Physics and Astronomy, Iowa State University, Ames

  • J.W. Kim

    • Advanced Photon Source, Argonne National Laboratory

  • D.K. Pratt

    • Ames Laboratory and Dep. of Physics and Astronomy, Iowa State University, Ames

  • A. Thaler

    • Ames Laboratory and Dep. of Physics and Astronomy, Iowa State University, Ames

  • S.L. Bud'ko

    • Ames Laboratory and Dep. of Physics and Astronomy, Iowa State University, Ames

  • P.C. Canfield

    • Ames Laboratory and Dep. of Physics and Astronomy, Iowa State University, Ames

  • B.N. Harmon

    • Ames Laboratory and Dep. of Physics and Astronomy, Iowa State University, Ames

  • R.J. McQueeney

    • Ames Laboratory and Dep. of Physics and Astronomy, Iowa State University, Ames

  • A.I. Goldman

    • Ames Laboratory and Dep. of Physics and Astronomy, Iowa State University, Ames