Neutron scattering studies of competing magnetic and superconducting order parameters in Ba(Fe$_{1-x}$Co$_{x})_{2}$As$_{2}$

ORAL

Abstract

Neutron and x-ray diffraction studies show that the simultaneous first-order transition to an orthorhombic and antiferromagnetic (AFM) ordered state in BaFe$_{2}$As$_{2}$ splits into two transitions, and T$_{N }$as well as the ordered moment decrease as x ({\%}Co) increases.~ Recent experiments have demonstrated that for a range of doping, superconductivity and magnetism co-exist homogeneously and compete for electrons.~ The magnetic order parameters have been measured for a series of Co doping from x = 0 to 6.3{\%} and a clear drop in sublattice magnetization is observed at T$_{C}$ for each compound.~ Comparison of these measurements to mean field calculations has provided insight into these competing order parameters.~ The good agreement between the measurement and calculations show that neutron scattering is a useful probe for understanding the symmetry of the superconducting gap in the iron-arsenide superconductors.$^{ }$ The work at the Ames Laboratory was supported by the US DOE, office of science, under contract No. DE-AC02-07CH11358.

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Authors

  • Daniel Pratt

    Ames Laboratory / Iowa State University

  • Rafael Fernandez

    Ames Laboratory / Iowa State University

  • Wei Tian

    Ames Laboratory / Iowa State University

  • Jerel Zaretsky

    Ames Laboratory / Iowa State University

  • Andreas Kreyssig

    Ames Laboratory and Iowa State University, IA, USA, Ames Laboratory / Iowa State University

  • Shibabrata Nandi

    Ames Laboratory / Iowa State University

  • Min Gyu Kim

    Ames Laboratory / Iowa State University

  • A. N. Thaler

    Ames Laboratory / Iowa State University, Dept of Physics/Ames Laboratory, Iowa State University, Department of Physics and Astronomy, Iowa State University

  • N. Ni

    Ames Laboratory and Iowa State University, IA, USA, Ames Laboratory / Iowa State University, Ames Laboratory, Dept of Physics/Ames Laboratory, Iowa State University, Department of Physics and Astronomy, Iowa State University

  • S.L. Bud'ko

    Ames Laboratory and Iowa State University, IA, USA, Ames Laboratory / Iowa State University, Ames Laboratory, Ames Laboratory/Iowa State University, Dept of Physics/Ames Laboratory, Iowa State University, Ames Laboratory and Department of Physics and Astronomy, Iowa State University

  • P.C. Canfield

    Ames Laboratory and Iowa State University, IA, USA, Ames Laboratory / Iowa State University, Ames Laboratory, Dept of Physics/Ames Laboratory, Iowa State University, Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames Laboratory/Iowa State University

  • Rob McQueeney

    Ames Laboratory / Iowa State University, Dept. of Physics and Astronomy, Iowa State University and Ames Laboratory, USDOE , Ames, Iowa 50011 USA, Iowa State University, Ames Laboratory

  • J\"org Schmalian

    Ames Lab and Iowa State University, Ames Laboratory / Iowa State University, Iowa State University

  • Alan Goldman

    Ames Laboratory and Iowa State University, IA, USA, Ames Laboratory / Iowa State University