Interplay between spin-vortex crystal magnetic order and superconductivity in transition-metal doped CaKFe<sub>4</sub>As<sub>4</sub>

ORAL

Abstract

CaKFe4As4 is an iron arsenide superconductor in which partial substitution of Fe by a transition metal shifts the ground state from superconducting to antiferromagnetically (AFM) ordered. Employing single-crystal neutron diffraction data we show that the AFM order is a non-collinear, commensurate structure with a hedgehog spin-vortex crystal (SVC) arrangement within the Fe planes and a simple AFM stacking perpendicular to them. The long-range SVC order coexists with superconductivity, however, the interplay of both phenomena depends on the kind of transition-metal doping: For electron-doping by Ni, a gradual suppression of the ordered magnetic moment is observed with decreasing temperature below the superconducting transition temperature. For hole-doping by Mn, the ordered magnetic moment increases smoothly with decreasing temperature and superconductivity seem not to influence the magnetic order.

*This work was supported by the U. S. DOE, BES, DMSE, under Contract DE-AC02-07CH11358. This research used resources at HFIR, a U. S. DOE Office of Science User Facility operated by the Oak Ridge National Laboratory. W. M. was funded, in part, by the Gordon and Betty Moore Foundation's EPiQS Initiative through Grant No. GBMF4411.

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Presenters

  • Andreas Kreyssig

    • Physics and Astronomy, Iowa State University/Ames Laboratory
    • Department of Physics and Astronomy, Ames Laboratory, Iowa State University
    • Ames Lab/Iowa State
    • Ames Laboratory, Iowa State University, Dept. of Physics and Astronomy, Ames
    • Ames Laboratory and Iowa State Univeristy

Authors

  • John M. Wilde

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

  • Wei Tian

    • Oak Ridge National Laboratory, Oak Ridge
    • Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
    • Oak Ridge National Lab

  • Mingyu Xu

    • Ames Laboratory, Iowa State University, Dept. of Physics and Astronomy, Ames
    • Iowa State University/AmesLab
    • Iowa State University

  • Bing Li

    • Ames Laboratory, Iowa State University, Dept. of Physics and Astronomy, Ames
    • Ames Laboratory and Iowa State Univeristy
    • Ames Laboratory and Iowa State University, Ames, IA USA 50011

  • Benjamin G. Ueland

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

  • Anna E. Böhmer

    • Ames Laboratory, Iowa State University, Ames; Karlsruhe Institute of Technology, Karlsruhe
    • Karlsruhe Institute of Technology, Institut für Festkörperphysik

  • William Meier

    • Ames Laboratory, Iowa State University, Ames; Oak Ridge National Laboratory, Oak Ridge
    • Oak Ridge National Lab

  • Sergey L. Bud'ko

    • Department of Physics and Astronomy, Ames Laboratory, Iowa State University
    • Ames Laboratory, Iowa State University
    • Ames Laboratory, Iowa State University, Dept. of Physics and Astronomy, Ames
    • Ames Laboratory, U.S. Department of Energy, and Department of Physics and Astronomy, Iowa State University
    • Ames Laboratory/Iowa State University

  • Alan I. Goldman

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

  • Robert J. McQueeney

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

  • Paul C. Canfield

    • Ames Laboratory/Iowa State University
    • Department of Physics and Astronomy, Ames Laboratory, Iowa State University
    • Ames Laboratory, Iowa State University, Dept. of Physics and Astronomy, Ames
    • Ames Laboratory, U.S. Department of Energy; Department of Physics, Iowa State University

  • Andreas Kreyssig

    • Physics and Astronomy, Iowa State University/Ames Laboratory
    • Department of Physics and Astronomy, Ames Laboratory, Iowa State University
    • Ames Lab/Iowa State
    • Ames Laboratory, Iowa State University, Dept. of Physics and Astronomy, Ames
    • Ames Laboratory and Iowa State Univeristy