Chemical tuning of magnetism and superconductivity in Fe$_{1+x}$(Te,Se)

ORAL

Abstract

We present evidence demonstrating how the magnetism and superconductivity can be tuned for the phases Fe$_{1+x}$Te and Fe$_{1+x}$Te$_{1+y}$Se$_{1+y}$. Through the use of iodine vapor as an oxidant, we can de-intercalate these materials to remove the interstitial iron, \textit{i.e} the $x$ in Fe$_{1+x}$(Te,Se). Our analysis of the neutron inelastic scattering indicates that paramagnetism from this interstitial iron is detrimental to superconducting properties, and magnetization measurements show that superconducting volume fraction is indeed increased as the amount of interstitial iron is removed. Diffraction results detailing changes in key structural parameters and magnetic ordering will also be presented.

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Authors

  • Efrain Rodriguez

    • NIST Center for Neutron Research

  • Chris Stock

    • NIST Center for Neutron Research

  • Nick Butch

    • Center for Nanophysics and Advanced Materials, U. of Maryland
    • Center for Nanophysics and Advanced Materials, Department of Physics, University of Maryland, College Park, MD
    • Center for Nano Physics and Advanced Materials, Department of Physics, University of Maryland, College Park, MD
    • Department of Physics, University of Maryland
    • Center for Nanophysics and Advanced Materials, Department of Physics, University of Maryland, College Park
    • University of Maryland
    • Center for Nanophysics \& Advanced Materials and Department of Physics, University of Maryland, College Park, MD 20742, USA

  • Johnpierre Paglione

    • Center for Nanophysics and Advanced Materials, U. of Maryland
    • University of Maryland
    • Center for Nanophysics and Advanced Materials, Department of Physics, University of Maryland, College Park, MD
    • Center for Nano Physics and Advanced Materials, Department of Physics, University of Maryland, College Park, MD
    • Department of Physics, University of Maryland
    • University of Maryland at College Park
    • Center for Nanophysics \& Advanced Materials and Department of Physics, University of Maryland, College Park, MD 20742, USA

  • Mark Green

    • NIST Center for Neutron Research