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.

*This work was supported by AFOSR MURI Grant FA9550-09-1-0603.

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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