STM Investigation of the (001) surfaces of the Parent and Co-doped BaFe$_{2}$As$_{2}$

ORAL

Abstract

We have used a UHV Low Temperature STM to study the surface structure of the parent and the Co-doped BaFe$_{2}$As$_{2}$ single crystals. Various STM images with different structural symmetry were observed. The dominant apparent surface structure is ($\surd $2 x$\surd $2)R45$^{O}$ for the parent compound and 1 x 2 stripe-like for the Co-doped ones. We will compare the different surface structures and discuss the identification of the atomic plane exposure and the possible origins for such variety in surface structure.

*Funding support from Texas Center for Superconductivity at UH, Robert A. Welch Foundation, and from DOE-BES-DMSE

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Authors

  • S. H. Pan

    • University of Houston, Houston, Texas 77204-5002

  • A. Li

    • University of Houston, Houston, Texas 77204-5002

  • D. R. Jayasundara

    • University of Houston, Houston, Texas 77204-5002

  • Y. Xuan

    • University of Houston, Houston, Texas 77204-5002

  • J. P. O'Neal

    • University of Houston, Houston, Texas 77204-5002

  • R. Jin

    • Louisiana State University, Baton Rouge, LA 70803-4001

  • E. W. Plummer

    • Louisiana State University, Baton Rouge, LA 70803-4001

  • R. Jin

    • Oak Ridge National Laboratory, Oak Ridge, TN 37831

  • A. S. Sefat

    • Oak Ridge National Laboratory, Oak Ridge, TN 37831

  • M. A. McGuire

    • Oak Ridge National Laboratory, Oak Ridge, TN 37831

  • B. C. Sales

    • Oak Ridge National Laboratory, Oak Ridge, TN 37831

  • D. Mandrus

    • Oak Ridge National Laboratory, Oak Ridge, TN 37831