Doping Dependence of Scanning Tunneling Spectroscopy on Single Crystal Ba(Fe$_{1-x}$Co$_{x})_{2}$As$_{2}$

ORAL

Abstract

We have used a low temperature STM to investigate the density of states (DOS) on atomically clean (001) surface of single crystals Ba(Fe$_{1-x}$Co$_{x})_{2}$As$_{2 }$with Co doping level from x = 0 to 0.20 at 4.2 K. The data set includes the parent compound, the entire superconducting dome, and into the normal metal. With increasing doping concentration the tunneling spectrum shows a systematic evolution. We will present the details of such a spectral evolution and compare them with the band structure derived from ARPES experiments and theoretical calculations.

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Authors

  • Shuheng Pan

    • Department of Physics and Texas Center for Superconductivity, University of Houston

  • Ang Li

    • Department of Physics and Texas Center for Superconductivity, University of Houston

  • Jihua Ma

    • Department of Physics and Texas Center for Superconductivity, University of Houston /Department of Physics, Boston College

  • Jared O'Neal

    • Department of Physics and Texas Center for Superconductivity, University of Houston

  • A. Sefat

    • Oak Ridge National Laboratory

  • M. McGuire

    • Oak Ridge National Laboratory

  • B. Sales

    • Oak Ridge National Laboratory

  • D. Mandrus

    • Oak Ridge National Laboratory

  • R. Jin

    • Department of Physics and Astronomy, Louisiana State University

  • E. Plummer

    • Department of Physics and Astronomy, Louisiana State University