Surface structure and electronic properties in Ca$_{10}$(Pt$_{4}$As$_{8}$)(Fe$_{2}$As$_{2}$)$_{5}$

ORAL

Abstract

Among Iron-based superconductors, a new family of Ca$_{10}$(Pt$_{n}$As$_{8}$)(Fe$_{2}$As$_{2}$)$_{5}$ with n= 3 (``10-3-8'') or n=4 (``10-4-8'') is unique owing to the existence of Pt$_{n}$As$_{8}$ layer. This sets them with different electronic properties than the rest of Iron-based superconductors. By cleaving 10-4-8 single crystals (T$_{c}$ $\sim$ 34 K) in the ultra-high vacuum, we are able to observe three surfaces: Ca layer, FeAs layer, and Pt$_{4}$As$_{8}$ layer. Scanning tunneling microscope (STM) reveals both the topology and electronic density of individual layers. We discuss the implications of our results with the combination of bulk electronic properties.

*NSF DMR-1002622

–

Authors

  • Jisun Kim

    • Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803

  • Guorong Li

    • Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803
    • Dept. of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803

  • A.B. Karki

    • Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803
    • Dept. of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803

  • Jiandi Zhang

    • Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803
    • Dept. of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803
    • Louisiana State University

  • Rongying Jin

    • Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803
    • Dept. of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803
    • Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA

  • E. Ward Plummer

    • Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803
    • Dept. of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803
    • Louisiana State University