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