High Temperature Resistivity in the Sr-122 Iron Pnictides and in the Electron-Doped Cuprates

ORAL

Abstract

The electrical resistivity in the Sr-122 iron-pnictides and electron-doped cuprates were measured up to 800K. A resistivity saturation at the Mott-Ioffe-Regel limit was observed in the $SrFe_2As_2$ system, both in the parent compound and at several dopings, Ni=0.14, Ni=0.18, Co=0.3. Below this limit, but above the Debye temperature, the resistivity increases linearly. The electron-doped cuprates, PCCO and NCCO, were also measured at high temperatures. The resistivity does not saturate, showing a violation of the Mott-Ioffe-Regel limit consistent with other cuprate systems. This contrasts strongly with the 122's more typical metallic behavior. Supported by NSF grant DMR-0653535.

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Authors

  • Paul Bach

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

  • S. Saha

    • University of Maryland, Physics Department
    • University of Maryland, College Park
    • Center for Nanophysics and Advanced Materials, University of Maryland
    • Center for Nanophysics and Advanced Materials, Department of Physics, University of Maryland, College Park, MD 20742
    • Center for Nano Physics and Advanced Materials, Department of Physics, University of Maryland
    • University of Maryland, College Park, Center for Nanophysics and Advanced Materials

  • K. Kirshenbaum

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

  • J. Paglione

    • 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
    • Center for Nanophysics and Advanced Materials, University of Maryland
    • Center for Nanophysics and Advanced Materials, Department of Physics, University of Maryland, College Park, MD 20742
    • Center for Nano Physics and Advanced Materials, Department of Physics, University of Maryland
    • University of Maryland, College Park, Center for Nanophysics and Advanced Materials

  • Richard Greene

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