Multiple Distinct Magnetic and Superconducting Phases in LaFeAs<sub>1-x</sub>P<sub>x</sub>O 1111 Characterized Via X-ray and Neutron Diffraction

ORAL

Abstract

Following the discovery of the microscopic co-existence of antifermagnetic spin density waves and superconductivity in Ba1-xKxFe2As2 and the low temperature structural re-entrance to the novel magnetic C4 tetragonal phase in Ba1-xNaxFe2As2, an effort was made to seek similar phases in the related LaFeAs1-xPxO 1111 system. Previous work had reported two superconducting domes as well as two distinct magnetic regions. While the low doping magnetic phase had been well characterized by neutron diffraction, the higher doped magnetic region had been deduced from short range 31P-NMR measurements. We present a detailed characterization of the nuclear and magnetic structures based on high resolution and high intensity x-ray and neutron powder and single crystal diffraction. Our work demonstrates distinct magnetic symmetries for the two magnetic regions of the phase diagram.

*Work at the Materials Science Division at Argonne National Laboratory was supported by the US Department of Energy, Office of Science, Materials Sciences and Engineering Division.

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Presenters

  • Ryan Stadel

    • Northern Illinois University
    • Department of Physics, Northern Illinois University

Authors

  • Ryan Stadel

    • Northern Illinois University
    • Department of Physics, Northern Illinois University

  • Matthew Krogstad

    • Materials Science Division, Argonne National Laboratory
    • Argonne National Laboratory

  • Stephan Rosenkranz

    • Materials Science Division, Argonne National Laboratory
    • Argonne National Laboratory

  • Raymond Osborn

    • Materials Science Division, Argonne National Laboratory
    • Argonne National Laboratory

  • Keith Taddei

    • Oak Ridge National Laboratory
    • Neutron Scattering Division, Oak Ridge National Laboratory
    • HFIR, Oak Ridge National Laboratory

  • Dmitry Khalyavin

    • ISIS Neutron and Muon Source Science and Technology Facilities Council
    • ISIS, Rutherford Appleton Laboratory
    • ISIS Facility, STFC

  • Jinke Bao

    • Materials Science Division, Argonne National Laboratory
    • Argonne National Laboratory

  • Duck Young Chung

    • Materials Science Division, Argonne National Laboratory
    • Materials Science Division, Argonne National Lab
    • Argonne National Laboratory

  • Omar Chmaissem

    • Northern Illinois University
    • Department of Physics, Northern Illinois University
    • Argonne National Laboratory