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.

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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