Direct Determination of the Crystal Structure of Superconducting Ca<sub>10</sub>Pt<sub>4</sub>As<sub>8</sub>((Fe<sub>1-<i>x</i></sub>Pt<i><sub>x</sub></i>)<sub>2</sub>As<sub>2</sub>)<sub>5</sub>

ORAL

Abstract

Layered Ca10Pt4As8(Fe2As2)5 is unique because it is the only-known system that contains an metallic spacer between adjacent Fe2As2 layers and becomes optimally superconducting without chemical doping at ambient pressure. However, the unsolved crystal structure limits our understanding of structure-property relationship. Using electron diffraction and high-resolution scanning transmission electron microscopy (STEM), we are able to directly determine the structure of this superconductor: it forms a monoclinic structure (P 2 1/n) with the unit cell along the c direction doubled compared that found previously, i.e., c = 20.18 Å. Stacking faults along c-axis are commonly observed in the crystal. With the establishment of the crystal structure, the unique transport properties of our superconducting Ca10Pt4As8((Fe1-xPtx)2As2)5 (x ~ 0.05) single crystals with Tc = 34 K can be explained.

*This work is supported by U.S. NSF through grant No. DMR-1504226

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Presenters

  • Zhen Wang

    • Department of Physcis and Astronomy, Louisiana State University
    • Louisiana State University
    • Louisiana State Univ - Baton Rouge
    • Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory
    • Department of Physics and Astronomy, Louisiana State University

Authors

  • Zhen Wang

    • Department of Physcis and Astronomy, Louisiana State University
    • Louisiana State University
    • Louisiana State Univ - Baton Rouge
    • Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory
    • Department of Physics and Astronomy, Louisiana State University

  • Amar B. Karki

    • Department of Physcis and Astronomy, Louisiana State University

  • Jiayun Pan

    • Department of Physcis and Astronomy, Louisiana State University

  • Lijun Wu

    • Condensed Matter Physcis and Materials Science Departement, Brookhaven National Laboratory
    • Brookhaven National Laboratory
    • Brookhaven Natl Lab

  • Jing Tao

    • Condensed Matter Physcis and Materials Science Departement, Brookhaven National Laboratory

  • Yimei Zhu

    • Condensed Matter Physcis and Materials Science Departement, Brookhaven National Laboratory
    • Brookhaven National Laboratory
    • Condensed Matter Physics & Materials Science, Brookhaven National Laboratory
    • Brookhaven Natl Lab
    • Brookhaven National Lab
    • Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory
    • Department of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory
    • Condensed Matter Physics & Materials Science Department, Brookhaven National Laboratory

  • Jiandi Zhang

    • Department of Physcis and Astronomy, Louisiana State University
    • Louisiana State Univ - Baton Rouge
    • Department of Physics, Louisiana State University
    • Physics and Astronomy, Louisiana State University
    • Department of Physics and Astronomy, Louisiana State University

  • Rongying Jin

    • Department of Physics and Astronomy, Louisiana State University
    • Physics and Astronomy, Louisiana State Univ - Baton Rouge
    • Department of Physcis and Astronomy, Louisiana State University
    • Department of Physics & astronomy, Louisiana state University
    • Department of Physics, Louisiana State University
    • Louisiana State Univ - Baton Rouge
    • Physics and Astronomy, Louisiana State University
    • Physics, Louisiana State Univ
    • Department of Physics and Astronomy,, Louisiana State Univ - Baton Rouge

  • E Plummer

    • Physics and Astronomy, Louisiana State Univ - Baton Rouge
    • Department of Physcis and Astronomy, Louisiana State University
    • Louisiana State Univ - Baton Rouge
    • Department of Physics, Louisiana State University
    • Dept. of Physics and Astronomy , Louisiana State University, USA
    • Department of Physics & Astronomy, Louisiana State University
    • Department of Physics and Astronomy, Louisiana State University