Superconductivity in (Sr,Ba)Fe2As2 single crystals by Pt substitution

ORAL

Abstract

Iron-based superconducting materials with the ThCr2Si2 tetragonal crystal structure appear to show a maximum superconducting transition temperature of Tc $\sim $ 20-25 K when transition metals (e.g., Co, Ni, Ru, Rh, Pd, or Ir) are substituted for Fe, effectively doping d-electrons and suppressing the antiferromagnetic order of the parent compounds. However, this trend is known to be broken in the case of SrFe2-xNixAs2 and SrFe2-xPdxAs2, which both have lower optimal Tc values near 10 K. We will present our recent work on Pt substitution in single crystalline BaFe2As2 and SrFe2As2, which induces a maximum Tc of 23 K and 17 K, respectively. The relation between Pt substitution in these systems and the related cases of isoelectronic Ni and Pd substitution will be discussed.

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Authors

  • Tyler Drye

    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, University of Maryland at College Park

  • Shanta Saha

    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, University of Maryland at College Park, University of Maryland

  • Kevin Kirshenbaum

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

  • 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

  • Peter Zavalij

    Department of Chemistry and Biochemistry, University of Maryland, College Park, MD